Just checked how it works. Yeah, this is exactly what I had in my mind, unfortunately I don't usually read the manual and go straight to learning things on my own, so naturally I was not aware of this. In my opinion, making X exit the application would simplify the whole process of closing the app, because it would do exactly what people think it should do (exit the app, not put it somewhere in the icon tray). I had people asking me how to close it and I believe that shouldn't be a question. :)