Trying to reduce the ram overhead in this game (it wastes 13 bytes for each ball, from what I can see). But here's a Supercharger version of the game. I also threw in the NTSC/PAL palette select deal, and expanded the number of table setups to 30 (shot spoilers given at the bottom of the assembly file).
This one allows you to set up ball locations. Just flip the left difficulty switch and you can use both sticks to move all 4 of them (press the fire button to move an alternate ball)...the score area will display the correct values to use in the assembly file...so you can edit the assembly to include your own trick shots.