Hello,
I have just tested the command Foot pedal 1&2/Organ rotary slow/fast on my genos with a drawbars organ... It works, the leslie doesn't change immediatly, it takes a little time, that's great!
Pay attention to the fact that drawbars sounds are much better than the other organ ones because of this particular behavior of the leslie. Cherry on the cake, if you have a drawbars sound on left hand and another one on the right hand, the leslie works the same way on the two hands... this is not the case with the other organ sounds!