Good news, the izjs version lets you pretty much purchase every single gambit at the very beginning of the game. And the job system allows your characters to become really really good at one role, much stronger than they could have in the vanilla version. And quickenings dont use mp anymore, plus the new speedup button for grinding and traveling, plus zoning once now respawns chests and enemies instead of having to zone twice. Etc...
Are you serious?? holy, I did not know that. Damn, now I really want to play it again.