I didn't see a wish list on this board so I thought I'd start one myself. Hopefully, the dev team read this and would like some input from users.
I'll start with one simple wish:

I want to use my scrollwheel mouse in LimeWire's windows. Seems like this wouldn't be too hard to implement. I don't write in Java myself, so I don't know what would need to be changed to add this functionality, but IMO the GUI is already very friendly - I just wish it would respond to my wheel. I use it everywhere else. Why not here?