GCPad - Use different keyset while a certain button is pressed?

[EchoReaper]

I am playing Metroid on Dolphin r7423 x64, and the controls for the Keyboard in the GCPad aren't the best. I've set the controls up so far so that WASD are the movement keys, and the right mouse button is 'R' on the controller, but whenever I use 'R' I have to use WASD to move the camera. I was hoping there was a way to switch it to Axis +-X and +-Y when then right mouse button is pressed, and WASD when it isn't.