Since there was the fire, and doubtful anyone's posted this one again, at least none that I saw, here we go!
I think it would be neat to be able to drag-n-drop a channel name in the channel bar wherever you'd like it. I personally have to have my channels in a certain order, most used ones up front, least near the end. And sometimes, for some reasons, these channels get closed, and it would be nice to just "drag" it back into place, instead of /parting and rejoining all channels.
Also, if there could be a way to edit or even add popups to the channel /list window, menu clist or something, to add more options/abilities to that area.