Hi Mike,
Great work developing your drives.. I have been keeping up to date with your different drive arrangements over the years. Great to see the versatility of the basic unit with changes to the transmission details.
Like Anttipaa, I would also be interested to know if the controller can be integrated with a Torque Sensing bottom bracket (which is different to PAS / cadence sensing).
Riding bikes with torque sensing and "torque mode" controllers is safer and more natural feeling than bikes with PAS and "Speed mode" controller, because the motor's output is directly proportional to the force the rider is putting on the pedals.
PAS control adds a pre-set amount of power as soon as you start pedalling and keeps that power level regardless of changes in terrain, speed etc. With a 250 Watt motor that may be usable, but with a motor as powerful as yours, that is a crazy way to control a vehicle. However, with a torque sensing bottom bracket, even a relatively powerful motor will be controllable and enjoyable.
Some of the commercially available mid-drive motors have ISIS cranks and torque sensing and would be reliable even on a heavy-duty mountain bike.
Unfortunately, the only "stand-alone" torque sensing bottom brackets I have found use square taper shafts, (probably because there is not enough room to use stronger spindles within the standard bottom bracket diameter and still have room to fit the torque sensing gear, bearings etc). These might be strong enough for a sit-down bike, but I wouldn't trust them to hold up to my 90+kg standing on the pedals over rough ground and jumps.
I think the answer is: There will be a combination of Torque Sensor and controller (and maybe a Cycle Analyst) that can control any motor / drive system, including yours.
Something to keep in mind for the future.. your small block motor mated to a well tuned torque sensing control system would be fantastic fun to ride.. you would really feel like superman!