I think it would be appropriate to have the ability to customize hp/ap regen rates that are specific to character class.
Warrior - regen 2 HP/day - 2AP/day
Healer - regen 1 HP/day - 3AP/day
Mage - regen 0 HP/day - 5AP/day
I feel like mages, as the spellcasters, should have superior AP regen rates, while warriors as the tanks should have superior HP regen rates.
Not saying everyone has to agree with my setup, however, if we were all given the ability to customize HP/AP regen rates and make those regen rates class-specific, that would be cool.