It's really fucking not, setting up Player 1 is fine but then it automatically tries to set up player 2 and then starts overriding my Player 1 settings because I can't cancel or get out it at that point, it's like no fuck off I'm never going to local play this game on one keyboard so stop putting that option there.
It shouldn't be overriding your player 1 settings unless you're choosing duplicate keys for player 2. Just bind the player 2 keys to something on the other side of the keyboard, or another input method entirely. Skullgirls (and Iron Galaxy titles) are generally lauded for their easy control customization.