I'm pretty sure this is possible, but I don't know if anyone's done it yet. How about converting all the skills like Thief, Dancer, Bard, and Knight into one ability? Instead of Steal EXP and Steal Helm, the game completely randomizes which ability will be used. Steal Heart will have to be tweaked or excluded though. You will probably have to heighten the chances of getting a successful Steal or Rent in the game to make it more fair.