-Dynamically scale speed with weight.

-Give mobility penalties based on weight borne. (Slower getting up and turning.)

-Add a "tired jogging" animation (I suggest using the "at ease" jogging animation the player character uses, it is slower than the normal jog, and looks a little hunched over, thus appropriate for such.)

-Make moving over terrain inclines increase fatigue (both up and downhill, uphill slightly more than downhill. Energy expediture can be roughly estimated by looking at how much power vehicles need to climb hills.)

This needs to be at least acknowledged, so we know someone in BI is looking at this.

AT THE VERY LEAST WE NEED:

-Forced walk at max fatigue
-Shorter "hold breath" times when fatigued
-More punishing long term fatigue

No matter the fatigue state, weight borne should lower speed of:
-Changing stances
-Climbing into vehicles
-Increase speed of fatigue gained
-Increase weapons sway, slower speed of raising of weapon, slower reloads, slower weapons switches. SLOWER everything!
-LOWER RECOVERY of fatigue (currently identical across all weights carried. Carrying a backpack alone should be fatiguing.)
-WEIGHT should IMPOSE a penalty -minimum fatigue-. Once you start moving, your fatigue will not go below this level -without you dropping the weight!!!-. Even when prone, your weapon-sway will be reduced, but you will get up slower and your weapon sway standing will be increased again.