I once saw someone on an online forum claim that if a game had WASD movement and didn't allow jumping, that completely ruined the game for him. Perhaps jumping will make people like that happy, even if it doesn't actually do anything.
Actually there are a couple of places in Mooshu that jumping helped me get past a stone in the way and avoid fights where normal a wizard would have to go around and possibly end up in a fight. Also sometimes if you get caught on a rock jumping can help get you free.
what is the space bar for is there a quest or something that you need to jump to finish the quest? or is it just for fun
the space bar works to advance quest text, you automatically accept all the quests , I can rapid fire the space bar and clear all the text in seconds on my alts, pound it till I start jumping
