in a FFA what matters is kills divided minutes. People who waste their time dualing don't deserve not to be thrown over some edge. It doesn't even make sense to have your saber out. It's such a slow, clumsy way to kill someone compared to pushing them over the edge.
Really, one should look for easy kills like people typing, or trying to dual someone. They tend to fight back less.
So, to sum things up, if you want to dual, make sure no one is around who will blast you, and don't get upset if the person you want to dual shoots you with a rocket, because you deserve it for trying to dual with people in FFA.