Simple one. Just that in F9/All Windows I often discover that the window I’m looking for… is actually minimised in the Dock. I wonder if All Windows could actually make the minimised windows in the Dock flee up into the main expose-space? You know, so you could see all your windows…? They’d be smaller than the main windows, and would hang around the bottom of the screen so you know where they came from.
(And vaguely grouping the windows by app would be nice too.)
((Actually, some people might object to that, depending on how they work, so perhaps a new Exposé, “Absolutely All Windows”…F8?))