I would like to see you have to drink and eat food every so often.
It would be based on a stat system kinda like is the sims, but it would take longer for your hunger and thirst to run out than the sims.
It would be good go down and eat some food at the shop, or cook your own. the better the food the quiker it regeneratets your stats and so on....
Hungry or Thirsty you will walk slower and hit for less hitpoints
I think it would add a cool economic, roleplaying and realistic element to the gameplay, as long as it isnt too often, tedious and anoying.
anyways just my say in things.
good post and idea Deddarus