The keyrepeat is set to the same speed as level 10, the same as fast drop mode does. Just like the original Tetris which the rules are based on. I still agree though

Don't see how the hitdetection in Nibbles is bad though, it's as accurate as I can get it, theoretically. Fun mode is just for fun, and people have been able to play up to level 8 in regular mode, so it's not impossible

As for instant turns, I guess I could set a limit, but it's the players responsibility to not hit themselves.