Astral mana pots give 7709 mana on a 2m cooldown, resto pots give 40% mana on a 5m cd and martyr gives 30% on a 3m cd. There's no reason to ever go OOM unless you're too cheap to spend a few gold on crafting/buying. In that case it's just tough luck.
Why not make battle rez usuable to use on yourself or defrebrilation, because it IS a party skill. You already have a wide arsenal of mana regen items and skills including trance.