Cam,
Ga head. Try it. Next time you see her bike, stand next to it on the LHS, hold the LH handle bar with your left hand, reach over with your right hand, grab that mystery handle. Using your hip, you can throw the bike up and over like a cowboy throwin' a calf.
http://www.youtube.com/watch?v=fYqrvSR7eWMTo do this on the stock KX, you have to use the side cover and the plastic is not strong enough.
Comes in handy for loading, puttin' it on and off a stand, or moving around on a trail.
<<Neither of us were right.>>
What other two uses could you possibly have come up with?