Did you get it working? I've been trying to do the same thing, but can't seem to make it work. Right now player1_start begins Ms. PacMan for 1 player and player2_start begins Galaga for 2 players. I've tried going into the FBA menu to change the controls but when I cycle through the buttons, the only available start button is "Start (left)", which both player1_start and player2_start are bound to. Any help would be awesome!