Um, I have a ME-70 and the modulation section has an oactave option, so you can turn that on and then use the expression pedal as the wah-wah. ... Hope that helps ....
i think she meant if you can assign 1 expression pedal to 2 fx, like a wah and octave (controlled by the expression pedal)

If this is the case, I doubt it.

if it's a fixed octave effect, with a dynamically expression controlled wah, then yes.