I've owned this game for almost 30 years. I have mine set to very liberal rules. Bonus multiplier carries over ball to ball, side spinner keeps increased values, specials lite extra ball, not credits, you can accumulate up to 5 extra balls - even with all of that, I have only rolled this game over once and a 5 million+ point game is rare.
Some of the settings make this game hard to beat and frustrating, but setting it more liberally makes it more fun, especially for weaker players, IMO.
The only thing that I would change is to make the "O" easier to get. Set the top right target to give you the "O" instead of them both giving you the "B".
This was my first and still my favorite game.