I think it would be really nice if you could have the toolbar on JS/CSS pages as well, of course not showing the usual tools but some special ones to insert things you need on JS/CSS pages.
For example a button with {pre='function ', peri='name', post='() {\n\n}'}, buttons for if/while/for/...
There could be selects for the most frequently used CSS-properties and colors.
The search-and-replace is always a good idea.
The help could tell you useful things from simple JS-syntax to the functions defined in wikibit.js (addPortletLink for example is something where I never know where to put which parameter).
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=29908
https://bugzilla.wikimedia.org/show_bug.cgi?id=24041
https://bugzilla.wikimedia.org/show_bug.cgi?id=45850