When you open a window in Studio and wish to close it again because you don't need it after all it would be helpful if the Escape key could close it. For example, use Edit Comment to see a comment in the segment you are working on, then decide you just wish to close it.
Studio is full of these windows that would benefit from this. Perhaps development could do this as a matter of course seeing as it's standard windows behaviour in most applications? Shouldn't need anyone to tell a developer to specifically do this... should be standard operating procedure.