diff --git a/src/ApplicationLinker.php b/src/ApplicationLinker.php
index 1812196..6de2201 100644
--- a/src/ApplicationLinker.php
+++ b/src/ApplicationLinker.php
@@ -198,7 +198,7 @@ public function run(): void
                         $pathProxyToFile = $this->filesystem->findShortestPath(
                             $appWebDir . DIRECTORY_SEPARATOR . $relativePathName,
                             $appVendorDir . DIRECTORY_SEPARATOR . $relativePathName,
-                        );                        
+                        );
                     }
 
 
diff --git a/src/HordeReconfigureCommand.php b/src/HordeReconfigureCommand.php
index aee4497..97ed67d 100644
--- a/src/HordeReconfigureCommand.php
+++ b/src/HordeReconfigureCommand.php
@@ -12,6 +12,7 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 use Horde\Composer\IOAdapter\SymphonyOutputAdapter;
+use InvalidArgumentException;
 
 class HordeReconfigureCommand extends BaseCommand
 {
@@ -19,6 +20,8 @@ protected function configure(): void
     {
         $this->setName('horde:reconfigure')->setAliases(['horde-reconfigure']);
         $this->addOption('mode', 'm', InputOption::VALUE_OPTIONAL, 'Should we "symlink" or "proxy" to the webdir?', 'symlink');
+        $this->addOption('webroot', null, InputOption::VALUE_REQUIRED, 'The default webroot for the /horde, /js, /themes, /static and /$app dirs if not specifically overridden. Use either a relative path or a full HTTPS url. Examples: "/" (default), "/groupware", "http://localhost/", "https://horde.example.com"', '/');
+        $this->addOption('force', null, InputOption::VALUE_NONE, 'Delete and rewrite items normally left untouched', null);
         $this->setDescription('Rewrite autogenerated configuration');
         $this->setHelp(
             <<<EOT
@@ -40,16 +43,23 @@ protected function execute(InputInterface $input, OutputInterface $output): int
             die('Error: Command was run without a relation to composer itself');
         }
         $mode = $input->getOption('mode');
-        if (!in_array($mode, ['symlink', 'proxy', 'copy'])) {
-            $output->writeln('<error>Invalid mode. Must be "symlink", "proxy" or "copy". "symlink" is the current default.</error>');
+        $force = (bool) $input->getOption('force');
+        $webroot = $input->getOption('webroot') ?? '/';
+        if (!str_ends_with($webroot, '/')) {
+            $webroot .= '/';
+        }
+        try {
+            $reconfigureOptions = new ReconfigureOptions(mode: $mode, force: $force, webroot: $webroot);
+        } catch (InvalidArgumentException $e) {
+            $output->writeln('<error>' . $e->getMessage() . '</error>');
             return 1;
         }
         // This is needed to support PHP 7.4 (no union types) for both Composer 2.2 / 2.3
         // Cannot use instanceof here as the class will not exist in 2.2.
         if (get_class($composer) === 'Composer\PartialComposer') {
-            $flow = HordeReconfigureFlow::fromPartialComposer($composer, new SymphonyOutputAdapter($output), $mode);
+            $flow = HordeReconfigureFlow::fromPartialComposer($composer, new SymphonyOutputAdapter($output), $reconfigureOptions);
         } else {
-            $flow = HordeReconfigureFlow::fromComposer($composer, new SymphonyOutputAdapter($output), $mode);
+            $flow = HordeReconfigureFlow::fromComposer($composer, new SymphonyOutputAdapter($output), $reconfigureOptions);
         }
         return $flow->run();
     }
diff --git a/src/HordeReconfigureFlow.php b/src/HordeReconfigureFlow.php
index 947e341..761f0c3 100644
--- a/src/HordeReconfigureFlow.php
+++ b/src/HordeReconfigureFlow.php
@@ -26,13 +26,11 @@ class HordeReconfigureFlow
     /**
      * Modes: symlink, copy
      */
-    private string $mode = 'symlink';
     private DirectoryTree $tree;
 
-    public function __construct(DirectoryTree $tree, FlowIoInterface $io, string $mode = 'symlink')
+    public function __construct(DirectoryTree $tree, FlowIoInterface $io, public readonly ReconfigureOptions $options = new ReconfigureOptions())
     {
         $this->io = $io;
-        $this->mode = $mode;
         $this->tree = $tree;
     }
 
@@ -43,14 +41,14 @@ public function __construct(DirectoryTree $tree, FlowIoInterface $io, string $mo
      * @param FlowIoInterface|null $output
      * @return self
      */
-    public static function fromComposer(Composer $composer, ?FlowIoInterface $output = null, string $mode = 'symlink'): self
+    public static function fromComposer(Composer $composer, ?FlowIoInterface $output = null, ReconfigureOptions $options = new ReconfigureOptions()): self
     {
-        return self::fromAnyComposer($composer, $output, $mode);
+        return self::fromAnyComposer($composer, $output, $options);
     }
 
-    public static function fromPartialComposer(PartialComposer $composer, ?FlowIoInterface $output = null, string $mode = 'symlink'): self
+    public static function fromPartialComposer(PartialComposer $composer, ?FlowIoInterface $output = null, ReconfigureOptions $options = new ReconfigureOptions()): self
     {
-        return self::fromAnyComposer($composer, $output, $mode);
+        return self::fromAnyComposer($composer, $output, $options);
     }
 
     /**
@@ -64,8 +62,9 @@ public static function fromPartialComposer(PartialComposer $composer, ?FlowIoInt
      *
      * @TODO Refactor this once we require PHP 8.0 or higher
      */
-    private static function fromAnyComposer($composer, ?FlowIoInterface $output = null, string $mode = 'symlink'): self
+    private static function fromAnyComposer($composer, ?FlowIoInterface $output = null, ReconfigureOptions $options = new ReconfigureOptions()): self
     {
+        $mode = $options->mode;
         // Symlink mode does not work on Windows
         if ($mode == 'symlink') {
             $mode = strncasecmp(\PHP_OS, 'WIN', 3) === 0 ? 'copy' : 'symlink';
@@ -77,7 +76,7 @@ private static function fromAnyComposer($composer, ?FlowIoInterface $output = nu
         }
         $outputInterface = $output ?? new SymphonyOutputAdapter(ComposerFactory::createOutput());
         $tree->withVendorDir($vendorDir);
-        $flow = new HordeReconfigureFlow($tree, $outputInterface, $mode);
+        $flow = new HordeReconfigureFlow($tree, $outputInterface, $options);
         return $flow;
     }
     /**
@@ -86,6 +85,7 @@ private static function fromAnyComposer($composer, ?FlowIoInterface $output = nu
     public function run(): int
     {
         // Get installed packages of types handled by installer
+        $mode = $this->options->mode;
         $filesystem = new Filesystem();
         // This is sufficient for now but we actually know better
         $hordeApps = InstalledVersions::getInstalledPackagesByType('horde-application');
@@ -95,6 +95,36 @@ public function run(): int
         // We could simply ask InstalledVersions here, too
         $rootPackageDir = $this->tree->getRootPackageDir();
         $vendorDir = $this->tree->getVendorDir();
+        if ($this->options->force) {
+            $this->io->writeln('Force mode enabled, removing existing files');
+            // Todo: Delegate to a method or helper class
+            foreach ($hordeApps as $app) {
+                [$vendorName, $appName] = explode('/', $app);
+                // horde.local.php files
+                $filesystem->remove($this->tree->getVarConfigDir() . '/' . $appName . '/horde.local.php');
+                $filesystem->remove($vendorDir . '/' . $vendorName . '/' . $appName . '/config/horde.local.php');
+                if ($app == 'horde') {
+                    // remove horde registry file
+                    $filesystem->remove($this->tree->getVarConfigDir() . '/horde/registry.d/00-horde.php');
+                    $filesystem->remove($this->tree->getVarConfigDir() . '/horde/registry.d/01-location-' . $appName . '.php');
+                } else {
+                    // remove app registry file
+                    $filesystem->remove($this->tree->getVarConfigDir() . '/horde/registry.d/02-location-' . $appName . '.php');
+                }
+                // remove webdir items
+                $filesystem->remove($this->tree->getWebReadableRootDir() . '/' . $appName);
+                $filesystem->remove($this->tree->getWebReadableRootDir() . '/js/' . $appName);
+                $filesystem->remove($this->tree->getWebReadableRootDir() . '/themes/' . $appName);
+                // remove vendor dir items
+                $filesystem->remove($vendorDir . '/' . $vendorName . '/' . $appName . '/config/conf.php');
+                $filesystem->remove($vendorDir . '/' . $vendorName . '/' . $appName . '/config/hooks.php');
+                $filesystem->remove($vendorDir . '/' . $vendorName . '/' . $appName . '/config/backends.local.php');
+                $filesystem->remove($vendorDir . '/' . $vendorName . '/' . $appName . '/config/prefs.local.php');
+                $filesystem->remove($vendorDir . '/' . $vendorName . '/' . $appName . '/config/routes.local.php');
+            }
+        } else {
+            $this->io->writeln('Force mode not enabled, skipping removal of existing files');
+        }
         $this->io->writeln('Applying /presets for absent files in /var/config');
         $presetHandler = new PresetHandler($rootPackageDir, $filesystem);
         $presetHandler->handle();
@@ -104,24 +134,24 @@ public function run(): int
             $filesystem
         );
         $snippetHandler->handle();
-        $this->io->writeln('Configuration mode: ' . $this->mode);
+        $this->io->writeln('Configuration mode: ' . $mode);
         $this->io->writeln('Writing app configs to /var/config dir');
         $registrySnippetFileWriter = new RegistrySnippetFileWriter(
             $filesystem,
             $rootPackageDir,
             $hordeApps,
-            $this->mode
+            $this->options
         );
         $registrySnippetFileWriter->run();
         $hordeLocalWriter = new HordeLocalFileWriter(
             $filesystem,
             $rootPackageDir,
             $hordeApps,
-            $this->mode
+            $mode
         );
         $hordeLocalWriter->run();
         $this->io->writeln('Linking app configs to /web Dir');
-        $configLinker = new ConfigLinker($rootPackageDir, $this->mode);
+        $configLinker = new ConfigLinker($rootPackageDir, $mode);
         $configLinker->run();
         $this->io->writeln('Linking javascript tree to /web/js');
         $jsLinker = new JsTreeLinker(
@@ -129,7 +159,7 @@ public function run(): int
             $this->tree,
             $hordeApps,
             $hordeLibraries,
-            $this->mode
+            $mode
         );
         $jsLinker->run();
         $this->io->writeln('Linking themes tree to /web/themes');
@@ -137,7 +167,7 @@ public function run(): int
             $filesystem,
             $rootPackageDir,
             $vendorDir,
-            $this->mode
+            $mode
         );
 
         foreach ($hordeThemes as $theme) {
@@ -151,7 +181,7 @@ public function run(): int
         }
         $themesHandler->setupThemes();
         // ApplicationLinker must run after all changes to /vendor
-        $appLinker = new ApplicationLinker($filesystem, $hordeApps, $rootPackageDir, $this->mode);
+        $appLinker = new ApplicationLinker($filesystem, $hordeApps, $rootPackageDir, $mode);
         $appLinker->run();
         return 0;
     }
diff --git a/src/ReconfigureOptions.php b/src/ReconfigureOptions.php
new file mode 100644
index 0000000..8ad22d8
--- /dev/null
+++ b/src/ReconfigureOptions.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Horde\Composer;
+
+use InvalidArgumentException;
+
+class ReconfigureOptions
+{
+    public function __construct(
+        public readonly string $mode = 'proxy',
+        public readonly bool $force = false,
+        public readonly string $webroot = '/'
+    ) {
+        if (!in_array($mode, ['symlink', 'proxy', 'copy'])) {
+            throw new InvalidArgumentException('Invalid mode. Must be "symlink", "proxy" or "copy". "symlink" is the current default.');
+        }
+    }
+}
diff --git a/src/RegistrySnippetFileWriter.php b/src/RegistrySnippetFileWriter.php
index faa0c0b..4c5bbb3 100644
--- a/src/RegistrySnippetFileWriter.php
+++ b/src/RegistrySnippetFileWriter.php
@@ -32,7 +32,7 @@ public function __construct(
          */
         private string $baseDir,
         array $apps,
-        private string $mode = 'symlink'
+        private ReconfigureOptions $options = new ReconfigureOptions(),
     ) {
         /**
          * The config dir for the registry
@@ -41,13 +41,14 @@ public function __construct(
         /**
          * The config dir for the registry snippets
          */
-        $this->configRegistryDir = $this->configDir . '/horde/registry.d';
-        $this->webDir = $baseDir . '/web';
+        $this->configRegistryDir = $this->configDir . DIRECTORY_SEPARATOR . 'horde' . DIRECTORY_SEPARATOR . 'registry.d';
+        $this->webDir = $baseDir . DIRECTORY_SEPARATOR . 'web';
         $this->apps = $apps;
     }
 
     public function run(): void
     {
+        $webrootUri = $this->options->webroot;
         // Ensure we have the base locations right
         $registry00FilePath = $this->configRegistryDir . '/00-horde.php';
         if (!file_exists($registry00FilePath)) {
@@ -55,7 +56,7 @@ public function run(): void
             '/**' . PHP_EOL .
             ' * AUTOGENERATED ONLY IF ABSENT' . PHP_EOL .
             ' * Edit this file to match your needs' . PHP_EOL .
-            ' * To redo, delete file and run `composer horde-reconfigure --mode=' . $this->mode . '`' . PHP_EOL .
+            ' * To reset from defaults, run `composer horde:reconfigure --force --mode=' . $this->options->mode . '`' . PHP_EOL .
             ' */' . PHP_EOL;
             $registry00FileContent .= sprintf(
                 '$deployment_webroot = \'%s\';
@@ -63,17 +64,26 @@ public function run(): void
 $app_fileroot = \'%s\';
 $app_webroot = \'%s\';
 ',
-                '/',
+                $webrootUri,
                 $this->webDir,
-                $this->webDir . '/horde',
+                $this->webDir . DIRECTORY_SEPARATOR . 'horde',
                 '/horde'
             );
             $this->filesystem->filePutContentsIfModified($registry00FilePath, $registry00FileContent);
         }
+        $webrootOverrideFilePath = $this->configDir . '/horde/registry.d/03-override-webroots.php';
+        $webrootOverrideFileSnippet = '<?php' . PHP_EOL .
+        '/**' . PHP_EOL .
+        ' * AUTOGENERATED ONLY IF ABSENT' . PHP_EOL .
+        ' * If you activate at least one of these lines, please also set a full https URL for the default webroot where the remaining apps and the assets (js, themes, static) are located' . PHP_EOL .
+        ' * Run `composer horde:reconfigure --mode=' . $this->options->mode . ' --webroot="https://assets.example.com/"`' . PHP_EOL .
+        ' */' . PHP_EOL;
 
         // Ensure we have a base
         foreach ($this->apps as $app) {
             [$appVendor, $appName] = explode('/', $app);
+            $webrootOverrideFileSnippet .= '// Customize ' . $app . ' webroot' . PHP_EOL;
+            $webrootOverrideFileSnippet .= "// \$this->applications['$appName']['webroot'] = 'https://$appName.example.com/';" . PHP_EOL;
             $registryAppSnippet = '<?php' . PHP_EOL .
             '/**' . PHP_EOL .
             ' * AUTOGENERATED FILE WILL BE OVERWRITTEN ON EACH' . PHP_EOL .
@@ -90,24 +100,35 @@ public function run(): void
                 $registryAppSnippet .=
                 '$this->applications[\'' . $appName . '\'][\'fileroot\'] = \'' . $appInVendorDir . '\';' . PHP_EOL .
                 '$this->applications[\'' . $appName . '\'][\'templates\'] = \'' . $appInVendorDir . 'templates' . DIRECTORY_SEPARATOR . '\';' . PHP_EOL .
-                '$this->applications[\'horde\'][\'webroot\'] = $app_webroot;' . PHP_EOL .
+                "\$this->applications['horde']['webroot'] = '{$webrootUri}horde/';" . PHP_EOL .
                 '$this->applications[\'horde\'][\'jsfs\'] = $deployment_fileroot . \'/js/horde/\';' . PHP_EOL .
-                '$this->applications[\'horde\'][\'jsuri\'] = $deployment_webroot . \'js/horde/\';' . PHP_EOL .
+                "\$this->applications['horde']['jsuri'] = '{$webrootUri}js/horde';" . PHP_EOL .
                 '$this->applications[\'horde\'][\'staticfs\'] = $deployment_fileroot . \'/static\';' . PHP_EOL .
-                '$this->applications[\'horde\'][\'staticuri\'] = $deployment_webroot . \'static\';' . PHP_EOL .
+                "\$this->applications['horde']['staticuri'] = '{$webrootUri}static/';" . PHP_EOL .
                 '$this->applications[\'horde\'][\'themesfs\'] = $deployment_fileroot . \'/themes/horde/\';' . PHP_EOL .
-                '$this->applications[\'horde\'][\'themesuri\'] = $deployment_webroot . \'themes/horde/\';';
+                "\$this->applications['horde']['themesuri'] = '{$webrootUri}themes/horde';" . PHP_EOL;
             } else {
                 // A registry snippet should ensure the install dir is known
                 $registryAppFilename = $this->configRegistryDir . '/02-location-' . $appName . '.php';
                 $registryAppSnippet .=
                 '$this->applications[\'' . $appName . '\'][\'fileroot\'] = \'' . $appInVendorDir . '\';' . PHP_EOL .
                 '$this->applications[\'' . $appName . '\'][\'templates\'] = \'' . $appInVendorDir . 'templates' . DIRECTORY_SEPARATOR . '\';' . PHP_EOL .
-                '$this->applications[\'' . $appName . '\'][\'webroot\'] = $this->applications[\'horde\'][\'webroot\'] . \'/../' . $appName . "';" . PHP_EOL .
                 '$this->applications[\'' . $appName . '\'][\'themesfs\'] = \'' . $this->webDir . DIRECTORY_SEPARATOR . 'themes' . DIRECTORY_SEPARATOR . $appName . DIRECTORY_SEPARATOR . '\';' . PHP_EOL .
-                '$this->applications[\'' . $appName . '\'][\'themesuri\'] = $this->applications[\'horde\'][\'webroot\'] . \'/../themes/' . $appName . '/\';';
+                '$this->applications[\'' . $appName . '\'][\'jsfs\'] = \'' . $this->webDir . DIRECTORY_SEPARATOR . 'js' . DIRECTORY_SEPARATOR . $appName . DIRECTORY_SEPARATOR . '\';' . PHP_EOL .
+                "\$this->applications['$appName']['webroot'] = '{$webrootUri}$appName/';" . PHP_EOL .
+                "\$this->applications['$appName']['jsuri'] = '{$webrootUri}js/$appName';" . PHP_EOL .
+                "\$this->applications['$appName']['themesuri'] = '{$webrootUri}themes/$appName';" . PHP_EOL .
+                '// End of ' . $appName . ' registry snippet' . PHP_EOL;
+            }
+            // Some versions of the middleware router require the routes.php file to exist even if empty
+            $routesFilePath = $appInVendorDir . DIRECTORY_SEPARATOR . 'config' . DIRECTORY_SEPARATOR . 'routes.php';
+            if (!file_exists($routesFilePath)) {
+                $this->filesystem->filePutContentsIfModified($routesFilePath, '<?php' . PHP_EOL . '// Empty default routes file. Put custom routes into var/config/' . $appName . '/routes.local.php and run composer horde:reconfigure' . PHP_EOL);
             }
             $this->filesystem->filePutContentsIfModified($registryAppFilename, $registryAppSnippet);
         }
+        if (!file_exists($webrootOverrideFilePath)) {
+            $this->filesystem->filePutContentsIfModified($webrootOverrideFilePath, $webrootOverrideFileSnippet);
+        }
     }
 }