Anyway to quit with the mouse or do you really need to switch to the keyboard to quit?
I guess since it's ScummVM a keyboard is necessary. (I recall in the original release a little window popping up and letting you click
yes or no.)
You can hit F5 to bring up a clickable option to quit but of course F5 is another key needed. :P
If you were actually playing, you'd probably want a keyboard anyway to hit "s" or "l" to save or load, anyway.