Many thanks for the great ideas. I think I'm going to tell them the proper name of the game is 5-ball (Keep It Simple Stupid!)
I've floated the idea of spotting a ball penalty for fouls and I think I'll try again. The problem is that there's no motivation to play safe; if player 1 plays safe and the player 2 fouls, player 3 gets BIH, not me. With a ball spot at least player 1 and 3 benefit. It's also a way to challenge the player with the fewest balls left. (We play BIH behind the headstring since you've only got five balls to pocket)
Green reps to rookiepsu and ramsey!
Thanks and I hope you enjoy the game. The men that taught me this would get highly PO'd if you left the person following you a shot so for me just starting out it helped me understand how to play safe.