Actually, I'm more partial of going the OTHER way, hardcore style.
No auto-regeneration of HP or Mana at all. If you want more, use potions, rest, etc.
But out-of-combat healing can even be a negative for you since you would enter the next battle with less mana.
Probably not going to happen since spells are AP rather than mana-based though (no objection from me for both ;))
