I love this program and aside from really wanting a folder tree view, I would love the ability to replace with regular expressions instead of just searching with them. Searching is great and all but using backreferences when replacing and other things is just as useful. I'd love if it that could be implemented.
Also, that tree folder view mentioned in another thread would be great too. One that allows me to get ot My Documents without having to go the long way through the C drive. Sure, it may be an odd Windows thing but it's easier than going the long way and having to scroll left and right when you're deep in folders.
Other than those, I love this program.