What you describe is standard rotation (same direction as the crankshaft spings)
The reverse rotation is for serpentine belt applications. The belt forms an "S" between the crank and waterpump pulleys. this pulls the waterpump with the backside of the belt and it spins "reverse" of the crankshaft.
By the nature of the inner workings of a fan clutch, it should not work the same in reverse. If you didn't know... The fan clutch is a pump. It just circulates the silicone fluid withen itself. The thermal spring controls a valve. When it senses heat, the spring closes the valve, the pump body now has a load on it and spins the fan. The more the valve closes, the more flow is stopped and the more locked up the pump/fan clutch becomes. Take it a step further and there is a pressure relief valve in there as well that opens to limit the fan RPM at really high engine speeds. If you go backwards the whole arrangment of pump and valves should all be wrong. Not saying that they don't make versions that will work both ways, but the one I have taken apart wouldn't be happy going the wrong way.
