I just discovered this setting after a beer on my grassy circuit. It felt like ‘easy mode’, I don’t think it was the beer 
.
Instead of having to be cautious and back off throttle on turns, TC just seemed to pull the rear truck in direction instead of slipping, everything felt really tight and stable. My friend was hoping it would help his powerslides, but in fact it seemed to do the opposite and hugged so tight we flew round our course.
This setting is a must-have for me for off-road riding now, until I find it’s issues that is.