I've been playing with
a randomizer, and it's been interesting. I set it to keep the jobs' commands the same (randomizing that includes swapping out !Fight, so otherwise I might end up with a Wind Crystal job that has literally no way of dealing damage), but the abilities they get on level up are shuffled.
So my jobs so far are Black Mage, Red Mage and Geomancer, but various abilities I've gotten from them include Dance (one of my favorites), GilToss, lv5 Time Magic, and Animals, but I'm not getting any Black Magic or Red Magic upgrades.
It also randomizes loot from various sources. So I got a useless bow and harp early game, and currently have some sweet RunningShoes and Mirage Vest. Also, Crew Dusts were dropping tents, so I have like twenty of 'em. Also, apparently stats are tweaked randomly. The only one I really noticed was when Gigases kept trying to use Aero but didn't have enough MP to cast it, which was a cute little surprise.
It's fun: the uncertainty is cool. Not knowing what ability I'll get after I level up classes, the possibility of getting something broken out of every chest. But it definitely feels easier than a standard Fiesta run: lots more options, and at least in the early game the loot is better overall.