jumping up/down obsticals is a physical stupidity. have you ever jumped down a hill? perhaps you've tried jumping up a hill? DERP! Do you fancy self inflicted bodily harm? Jump is for fun/effect/gaps/grasp thats right grasp! to reach with your hands what was too high before. no one jumps like you think they do... but if it had to be mapped to a button, id say the passive/active mode switch is best.