2 suggestions to help with the health/mana thing.
I was thinking about the high HP and Mana we have, and the fact that the food doesn't really help, and I remembered the
Winter Vail Candy (link). There's eggnog and candy corn and candy bars and some other stuff and it will get you pretty close to full health/mana in 20 seconds or so, and nobody would have to go through the headache of making a new item from scratch cause its already in teh game. Just throw it in the BB vendor. I have no idea how difficult that would be, but if it can be done, I'd love it
Another idea is to make a bandage that refills say 55k health. This is necessary because during a boss fight, you can drop out, heal (and mana up if you have lifetap

) and get back in fresh and ready to go while taking care of your self so the healing classes can DPS more and heal less. Also, if we're only getting hit like once a minute, you might be able to bandage up while tanking without getting interrupted.
This would require a new item, so I don't know how hard it would be to implement.
For the bandage, I'd suggest requiring a first aid skill of 300 so we'll actually have to skill it up to use them.