It would be really cool to see a collision ball race mutator, just like minigolf. Collision is enabled after a few seconds. Also low gravity would also be cool (with lower payouts I guess due to skips prolly being easier), which reminds me, why not have a gravity volume for ball race and minigolf? Would be cool to see a moon or space themed course sometime.
Another mutator I think would be cool would be a tethered ball race course. This was a suggestion by someone else somewhere else in the forums. Kinda like chained together but with the ball race balls.
Also top 10 should have a category for per eligible mutator