I think you just described us LOL. As long as I have a job leveled I can use that jobs weapons and glams, their LBs and actions lol. All they would have to do is add an achievement for not getting hit or dying in Ex or savage. Now if you want to have all the class abilities at once I'm gonna need more than 10 hotbars and special omni gear that gives me strength, intelligence, mind and Dexterity for any actions besides your main job to make any sense.