I think FFX's would have been better if instead of using your skills immediately and then tacking on the charge time to your wait time, you actually had to wait in between issuing the command and performing the action. It's too easy to just instantly cast Ultima and then wait to recover. You should have a charge time so that you have to consider if your character can actually survive the time needed to cast Ultima. There could even be auto-abilities or spells like Quicken to reduce the charge time.