This elfsight Wishlist widget I'm currently using to write this (and you to read this) is fantastic, and I wish I could have it on my site.

1. It would have multiple themes, and ideally, let design programmers have access to CSS files for full style control.

2. It would also let users create categories (possibly requiring backend approval) so that users aren't forced to put ideas in unrelated categoreis. For example, I had to put this idea in FAQ because there are no appropriate categories.

This Wishlist widget is such a great tool, I can think of a thousand uses for it as a stand alone site.