What would be cool imo is where you can have buttons change after a condition is met. This would at least be very helpful for main combos. An example, using pld, would be like you use Fast blade. The fast blade icon would turn to savage blade and another button would become riot blade. Then if you use Savage blade, the savage blade button becomes RoH and then the riot blade button becomes PLD's new move Royal authority. On the other hand if you use Riot blade, one of the buttons becomes PLD's new move Glory blade or w/e. Assuming they just keep extending the same tree's and branch them out it would allow for two buttons to always be used for every combo move, unless they extend it to 3 options some where along the "skill tree".