Here's a list of controller button numbers for your customization pleasure.
'''NOTE:''' As of 1.1.2, Joystick configuration saving has been temporarily disabled until I can figure out what's corrupting the cfg. That means GC pads are fully in the mix (except for the joysticks. I haven't figured out yet how to enable them). Based on user input, I will either distribute 1 config file that holds two wiimotes rigged for horizontal gameplay and two for the nunchuck combination, or I will release two, one for each gameplay method with all four wiimotes rigged for that method.