Hi Michael,

don't worry I have no problems if you leave the behaviour as it is. I just quit the OS X 10.6 calculator app using the red button. My faith in Apple is gone :-)))

The only benefit I see is when you have several windows open (and MoI is a multi window app) you expect the button to only close the specific window.
I just checked it and MoI does exactly that. When there are two MoI windows open it just closes one Window and if there's just one it closes the Window and (after a Delay) closes the app. Perfect.

Sorry for the trouble I may have caused.