Adding the switch into the start button stack is not considered a "hack", it's an accepted mod and if done neatly is quite useful.
Having said that, I use the technique off a low initial replay on Black Hole, just high enough to make me feel bad if I don't score an extra game. I can check a manual tomorrow and post what to do for that as I can't recall off the top of my head, someone else might post in the meantime.
