Default mac-fullscreen command

Greetings reader,

The fullscreen command in mac (cmd+f) stretches our game like an elastic over the screen. Double tapping the upper bar is working as intended. But the fullscreen-command (or the little green enlarge button in the upper left corner) screw up the ratio.

I've tested all possible player settings .

I've been all the way to the app/content's .nib files to remove the fullscreen shortcut, but the green button remaines.

Anyway to fix/disable this stretch? (preferably without update methods that check for screen.fullscreen)

Thanks in advance,

David