I am playing around with the idea that a reasonable buff to Cripple for WvW could be making it have percent damage increase to falling damage taken. Not a massive amount, but enough to warrant what would be sustained from trying to take a fall with already injured legs. I feel that with the addition of gliding to WvW, this could be an addition benefit to fighting in your own territory, and overall would add more tactical play to the gamemode. Just a thought, let me know you agree or disagree, should you feel inclined.