I believe minimum throttle override is supposed to change the engine's maximum throttle in flight. However, it doesn't seem to do much of anything.
When throttle is > 0 but less than minThrottleOverride, the engine throttle is set to minThrottleOverride.
minThrottleOverride
When throttle is > 0 but less than
minThrottleOverride, the engine throttle is set tominThrottleOverride.