This is the official control scheme for MP3.
A-Shoot, [Hold]Charge Beam, [Morph Ball] Bomb
B-Jump, Strafe around enemies
Grapple Beam-Forward Thrust of the Nunchuck
Yank Grapple-Fast Pull of the Nunchuck
Turning Nobs-Move Wiimote forward, Pull Back, Twist to the left, Push In
And if your wondering where i got this information, I've watched the latest videos of people playing MP3, and this is how the control scheme turned out. I'm not sure what 2 does, because I havent seen anyone use 2 yet.