I think it's a brilliant design Culpster! Hopefully I'm not too late to the discussion, if you don't mind a couple of inputs of course.

For pedal no. 5, which says Wah. You might wanna put Wah on the top half, and the lower half to read Multi-FX. This is in accordance to the latest 11PROM v1.3, since when Wah is disengaged....the exp pedal will be functioning as a Multi-FX control.

I second the idea of labeling Rig 1 to 4, which is generic but still useful for everyone.