Yeah, I figured out the erase bumper thing. I was more talking about after I sent a ball flying, I realized the bumpers weren't actually where I wanted them because the ball didn't go where I wanted it. It's really just a matter of being careful on the player's part, but at the same time I don't think it would be a big deal to give that undo as an option for boneheaded mistakes. I guess the only concern would be people could brute force solutions by trying lots of combos, but at the same time that seems like it would be a lot more work than just trying to think of a solution.