#....I don't know WHAT BIS was thinking when they didn't include options to (1) adjust, (2) disable, or (3) enable the fatigue system.
They did. Put this in your init.sqf
// Remove fatigue effects and make it persistent even after respawn
if (local player) then {
player enableFatigue false;
player addMPEventhandler ["MPRespawn", {player enableFatigue false}];
};