Dean,
I guess you are right! I was tending to think of the gyro precession in a sharp corner where insides and outsides behave oppositely---the reason for the Rabe Rudder.
But the propwash, I guess, is also the reason for the little bit of right thrust that we sometimes build into the motor.
The biggest problem with pushers is prop availability, but as I replied to someone else in another thread, APC seems to be producing more pusher E props too. Need to take a look to see if they have a 12-6 version.