I'm not saying to forget the users, I'm saying to actually address *all* of them, specifically and separately. As cross-platform as Qt may be, there are still certain quirks from platform to platform, and it is not easy to categorically search for and identify what these differences are, unless you happen across it by chance somewhere in the documentation.
I believe http://doc.trolltech.com/4.1/winsystem.html is a good start, but it just scratches the surface.