I would like to see a mode where you have to eat but you don't lose your item when you die because in casual all the food is pretty much useless and losing you item because you have fallen to death is pretty annoying
Getting a debuff while the yellow bar is empty in casual would be a nice addition instead of rendering food useless as the mode as it is at the moment.
There's a mod on the Steam Workshop to enable hunger in casual mode (as well as another to disable item drops in survival mode, not compatible with each other however). It's probably in the mod repository as well, but I primarily use Steam these days.