DevelopGuide.md: Update planned enhancements

docs/DeveloperGuide.md

@@ -857,4 +857,5 @@ Team size: 5
 6. **Add sharper colour contrast between assets and tags**: Currently, tags and assets have a very similar color scheme, which makes it hard to differentiate for users. In future versions, we will add more visual clarity tags and assets.
 7. **Make duplicate checking more robust**: The application enforces distinct contacts, but the user may add the same contact twice unintentionally (e.g. entering `dave tan` and `Dave Tan`). We plan to make duplicate checking more robust and potentially warn the user first in such cases.
 8. **Add a `remark` command**: At present users can only add additional information to contacts using tags. We plan to allow the user to add more detailed information like notes using a `remark` command.
-9. **Allow focusing of command input box and contacts list by keyboard shortcuts**: Currently, the user needs to click on the command input box and contacts list if they want to enter a command or scroll through the contacts list respectively. This runs counter to the philosophy of using only a keyboard for efficiency. We plan to add the ability to focus on each using only the keyboard.
+9. **Add command shortcuts and suggestions**: Currently, there is no support for any shortcuts and suggestions of commands to aid both experienced an new users. We plan to add command shortcuts and suggestions to make the application easier to use for all users.
+10. **Make phone number validation more robust**: Currently, we perform little validation on the phone number to allow for inputs such as `2555 (ext)` for the user's convenience. This however means that inputs such as `+++` may be accepted. We plan to improve phone number validation without restricting the user.