Quite fair, what I suggested would by no means be "perfecting", I was just throwing out a crazy idea.
I second the idea to have a toggle switch to choose which knob the expression pedal modifies.
A faster, dirtier pitch shifter would also be quite cool.
For the notch, what about using half of the sweep of a knob to control an envelope, and have to control an LFO? Or maybe a crossfade between the two?