Quoted from chuckwurt:Not possible on this game.
Quoted from knockerlover:I think the best way to do it is to set the replay award to like 10,000 points.
I've never done a System 80, but I've always had good luck adding a bit of wire from the start button to a coin switch. I toss a diode in there to prevent issues using one switch for 2 purposes, but so far it's worked well. On Bally's, I tap into the center coin wiring, as they are generally unused.