Convert a standard select to multiple when multiselect is attached

[TheWitness]

What is the current behavior?

Currently, multi-select has an issue with long select lists. The if you don't hide the dom you san see the switching from the standard multiple select to the new jQuery-multi-select. It is possible to create a standard select, but there are two artifacts, the first being that the actual select is not hidden, and the second part is that the multiple attribute is not added to the original select.

Expected behavior

I'm not sure if it's possible, I have not looked at the RFC, but it would be nice to be able to eliminate the screen effects by simply converting the normal selects to jquery multi-select.