I avoided both points, Job changing and tactical maps, for the sake of simplicity; Abot job changing, all the jobs are customizable enough so they can feel diverse - You can model Cecil (FF IV) with a white mage, for example. Anyway, I don't think it is impossible to create a jobchanging system, but it'll need its own supplement. Tactical map based combat is easier to do, but would require noting down range, effect and vertical values for each action. Also not that hard, but would also be better suited for another book. Maybe I should start working on these after finishing the one i'm doing now.