I see what you're saying, but from what they made it sound like it's not really strong enough to be a viable tactic. Plus, if you're going to attack from range I think dual pistols would be a much better option, or probably even short-bow. I don't think it's a completely useless skill because I'm assuming you do some damage with the cripple, but from what I've heard from people that have played the game it doesn't sound like it's all that practical.