I did try it. I was at the screen, and I hit every key on the keyboard, as well as kept clicking on the P1 and P2 sides. At most I got rid of the 2nd character on the P1 side, the control labels at the bottom changed to keyboard/keyboard buttons eventually, I got to a point where when I selected a character, P1 and P2 were locked on the same character. I spent about 15 mins just hitting random keys to try to make it a 1v1, with the characters I wanted. I couldn't manage to get it to 1v1, for example.