While I didn't mind "level as you use", I too agree wouldn't fit too well here. Someone mentioned something akin to getting ZP upon completing a quest or task, and I would have no issues with that as the way I see it, that final EXP tally is a "collimation" of everything you did to complete that quest, as such you are overall a better adventurer because of it. So it makes a bit of sense to divy out points to what you wish to learn. I'm sure their could be some kind of multi-levei....leveling....scheme, that has a combo of both quest exp, and skill-based useage as well.