I was able to have my 2nd analog stick on my controller mapped to pitch/roll - until they simplified the wiimote config - then the options disappeared.
Interesting.. i barely got it working
I used the "Roll and Pitch"
It's default is set to off, i simply ticked keyboard and set each affinity to 50 and Presto.
I was able to play Doing so Let the "Pitch Left and Right" inputs work, which was mandatory in the game.
SO THANKS A LOT DOLPHIN TEAM!!!!!!! *Note the sarcasm*