I think the addition of advanced skills should be very similar to the system in FFXI. Imagine having access to everything we have right now as our normal basic attack regieme. Advanced jobs like Black Mage and White Mage however would mirror abilities in FFXI (such as Elemental Seal) with 1.5-120 minute reset timers. Either a Whm or Blm could sub either Con or Tha, but the Blm would have a bunch of attack buffs while the Whm had cure buffs.