Ok. That makes more sense. Guess it doesn't change my tactics up any than, because I was thinking that, as you have pointed out, it can only fire the PotMS. So, move 6" and fire everything, 12" and only fire with PotMS.
I was hoping..because DSing LR counts it as moving at Cruising, so I wanted to DS it behind the line, point it at some infantry and unleash hell with the bolters and pop the closest tank with my MM. Guess I'll have to stick with popping the tank and just unload my cargo and let them pop the infantry.