I've been using UE for years and no doubt it's the best editor out there.
One recurring annoyance though is the fact that it generally takes ages or at least a Google search to find how to customize anything.
One easy improvement would be to add a "Remove" entry in the context menu anywhere in the program, which is the way Opera works and it's really cool.
Typically, this would allow to get rid of the last bar on the right or simply to remove a button from a toolbar in 2 clicks.
