You can't scroll between the game event selector when the song is playing (Using the keyboard or scrollwheel). It's smoother especially when doing arrow inputs
However the new input system has a bug where if you press with two events eligible for a press, both of them interact. I don't know whether to fix this or not.
I spent about 6 hours trying to fix this one specific bug involving the move undo. Turns out all I had to do was calm down and think logically instead of typing random bullshit for a few hours until it worked. I'm tired and I thank this for ruining my sleep schedule.