Stopping distance does not take credit for reverse thrust. If I'm not mistaken, the only time reverse thrust is accounted for is a rejected takeoff an a wet runway [25.109(f)], with the good engine at idle reverse. Standing by to be corrected if I'm wrong.
That said, if I'm landing with an inoperative reverser, I'll select idle reverse on the god side. The asymmetrical force isn't that significant at idle.
Last edited by Check Airman; 2nd January 2018 at 21:33.