I was just brainstorming on this and came up with this:
FS already has a function that allows you to move the view around using the mouse. You push a button on the keyboard (I think) and the mouse pointer disappears. When you move the mouse around, the view moves as well.
So if you could find some sort of remote device that would move the mouse pointer around on screen by aiming it (much like a laser pointer, but making the mouse pointer move) you could attach it to a hat or headband and simply push that one button, then move your head around. That would solve your issue.
I hope all that made sense!
