Ok, Here's the button/axis configurations:
Rock Band GuitarGreen
: Button 2Red : Button 3Yellow : Button 4Blue : Button 1Orange : Button 5Star-power/Overdrive : Button 6 The soloing/ higher frets are exactly the same but also press down button 7 at the same timeMinus : Button 9Plus : Button 10
The pickup switch thingy is the Z-Rotation axis and resets to center when changes are not being made
The Whammy is the Z-Axis and much the same way resets to center (not zero like I originally though, sorry)
Rock Band Drums
The drum pads press down the following buttons on the initial hit as well as button 8 much like the soloing frets on the guitar.
Red: Button 3
Yellow: Button 4
Blue: Button 1
Green: Button 2
The A,B,1,2,+, & - buttons press like any normal joystick button and are as follows
A: Button 2
B: Button 3
1: Button 1
2: Button 4
-: Button 9
+: Button 10
The D-pad is a POV hat just like the guitar.
Hope this was helpful, I'm willing to help with this as much as I can although I have no experience with coding on the Wii. I've only used Blitz Basic 3D, but I would recommend looking at FoFiX's (http://code.google.com/p/fofix/) source code if you have any problems.