This had been bugging me for a long time, and it's entirely possible you've seen it before. But on the Genesis game, at least on my emulator, when I press Up, A and Start all at once, it instantly ends the level by putting the time to 00:00. It had only been a minor annoyance until it cost me the solution of Watch Left or Right (Part Two) which is Sunsoft level 22. >_<
It's quicker than using the nuke function, but far less fun. =(
I used that all the time on the Megadrive, except I just used A and Start.
Ah yes, so it is. I discovered it by trying to pause and then hold A down so I could move the screen across without having to move the cursor all the way over. Unfortunately I sometimes did it too quickly and it ended up finishing the level, much to my annoyance. XD