I would like to see the adding of a thirst and hunger bar above the stamina and health bar, along with a better system for temperature.
Going to the character screen to find out how hungry, thirsty or how hot, cold you are can be a bind, especially when it takes time to load in the visualisation of your character in their gear.
Not everyone uses degrees Fahrenheit and I am sure the figures are out.
http://www.webmd.boots.com/a-to-z-guides/normal-body-temperature
My character has recently survived being at 40 degrees Fahrenheit.
https://en.wikipedia.org/wiki/Human_body_temperature