Request a command to check if fatigue is enabled to round out the fatigue command family.

unit enableFatigue BOOL
unit setFatigue NUMBER
getFatigue unit

Would be nice to have:

fatigueEnabled unit

Example application:

if (fatigueEnabled unit) then {
[(group unit),0] setWaypointSpeed 'LIMITED';
} else {
[(group unit),0] setWaypointSpeed 'FULL';
};