When roll backs occur, it is not good for the computer system. Unless a ride op has figured out a loophole in the system, they can't cause a rollback on purpose unless they somehow close the brakes through the launch area while the train is traveling through it. But 99.9% of the time, it is random.
You are wrong thier buddy. While I am not sure if the ride ops can tkae control of the ride from the operation pannel they certainly can and do controll the speed of the motor. When they replace the cable or when the hyrolic motor is 1st installed they do not launch it at full speed. They slowly break in the motor and or cable.