Here are a few thoughts on the subject. Approaching it from the piano:
first and foremost remove the takeup spool brake! Slow down the reroll
You can often change the gear that drives the upper spool (in rewind
only) to a gear that has more teeth, and then adding more links to the
chain (change the gear ratio). This will slow down the reroll without
affecting the play tempo in any way whatsoever. This will keep the player
from rewinding the roll so rapidly.
I have read that if you install a larger gear on the wind motor, it will
turn more slowly, using less suction. This is true, but it increases the
rewind speed also. It also decreases the power of the motor. Big motors
can tolerate this but smaller ones will "lope" even if nothing is wrong.
If you do this it is very important to change the rewind gear as well
Another way to do this is to simply disconnect the wind motor
accelerator. Then the reroll can be controlled by the tempo lever.