Another thing to note, the vents would only need to be adjusted when the heat load in a particular room changed too much which might mean only slight changes every now and then to adjust air distribution in response to changing seasons or a cold spell. You could still reap tons of benefits by getting the air flow close to optimum and not constantly readjusting to exactly meet the maximum. The video mentioned the vents closing when it reaches the proper temperature but I can't see why they wouldn't also open them partially to save on needless opening and closing vents.