Question Bill.

Why don't arranger modules have pitch bend wheel?

I can't think of any reasons why they should not.

Not all intended controllers have wheels/benders/joysticks.

A pedal function wouldn't be that much extra cost, do you think?

Here you are asking, "Why?"

I am asking, "Why not?".

Ian

BTW, Yamaha used to make a midi controller with wheels and other features called the MCS2 Midi Control Station...you could set on your piano and it gave you all kinds of control...adding a wheel to a module isn't much of a stretch, in my opinion.