TC is correct in that AB will stop the motor as quickly as possible (freezing it) even in Full auto. I meant that AB in full auto wouldn't address the issue of fully completing a cycle in that the piston will freeze wherever it happens to be when power is cut in full auto.
Also...as far as I can tell...the new SCU doesn't "see" the cycle as a PTW does. The PTW is based on optical sensors reading light through the little holes in the gear. The SCU has a micro switch that is essentially bumped by the cutoff lever...so more of a mechanical system.
I might be wrong on the SCU...I haven't fiddled with one myself...but that's what the guys say.