phoboss, but what if you urgently need to get up and run/shot/etc. for any reason? I think eating/drinking until you holding a button is much better.

I think the better idea is to add the ability to eat/drink something while you holding a button (same as shooting). So if you hold a button character keeps biting/drinking, if you press just once - character takes just one bite/drink.
If <eat/drink until full> action will be added than it will be impossible to cancel this action (stop eating/drinking) until character finishes.

I've got the compromise for you guys. What if the 3rd person view will be not available only while you in combat?