Many people seem to not know about this and whenever I get hosed by a TD not knowing it I’m quick to let them know:
On all (?) Sterns from Spiderman onwards, if a TD needs to give a player a compensation ball, they can just open the coin door, enter the service menu, adjust balls per game to 4, and close the coin door. Boom, all players now get an extra ball. You can write down the three unaffected players’ scores, and the player who got hosed gets an extra ball with game state maintained. This works on any ball, any player (except obviously player 4’s ball 3).
I’ve seen so many hosejobs that could have been avoided if the TD just knew of this feature since they already had keys to the games. I can only assume it isn’t used more because people don’t know about it.