Has there ever been a Final Fantasy game with a battle system that you thought could be SOOO much better with certain ideas? Well, if you have, now is the time to explain!

Battle systems that I know...

FF1: Set jobs determined at beginning of game.
FF3: Changable Jobs established throughout the game.
FF4: Set jobs determined by characters
FF6: Set jobs determined by characters, low hp limits
FF7: Materia, characters not very different from eachother, limit gauge
FF8: Junctions, characters, again, very similar, low hp limits
FF9: Set jobs determined by characters, ability system based on equipment, trance
FF10: Set jobs determined by characters, but allowing for mixed job classes, overdrives
FF10-2: Changeable Jobs established throughout the game.
FF12: License grid, Quickenings

If I could change some, I would make it so Junctioning magic to your skills allowed for special skills, such as Fire Strike and such...
I would give characters in FF7 more of a "class"...
I would allow for Trance to be saved
I would expand on the main overdrives(Tidus should have at least 1 more, and so should Auron)

So, what are your improvements?