Well there you go you learn something new everyday, I would never have imagined that you could run the engines in reverse, but I guess in theory it doesnt really matter which way an engine turns, obviously the timing marks would be different eg marked advance would become retard, the camshaft lobes would have to be ground the opposite way. As far as torque your right you have a trim plate to counteract right hand torque on a single engine unit so you can go straight and on a twin engine unit you counter rotate to reduce directional torque
Steve