If both players can do it then there is no issue with fairness. I have a jump cue and will jump. It's also fine for my opponent to jump - because jump shots are allowed. By saying what I've just said, I'm not saying I agree that jump shots should be allowed. "It's the same for both players" is a not a good argument because it would be the same for both players whatever the rules are (assuming the rules are not really weird and favour one player over the other).If both players can do it, what's the issue? Sure it might take less skill than a good kick, but at least both players can use it. It prevents lazy safety play. That speeds up the game and also encourages better safeties. Lock em up tight enough that shorty can't bail them out.