That was a good read where, but I'm still left with a few questions. I see how the torque can be shifted fore and aft by the center diff, as well as from side to side by engaging a particular wheel's brakes.

So what happens if you push the DSC button once? I assume that this only disables stability control which really reacts to excessive yaw rates (ie oversteer or understeer)? I think I have that right?

What happens if you push and hold DSC down for >10secs? That disables DSC AND traction control? Hence that essentially disables sensors from distributing torque from side to side AND front to rear? That confuses me a bit thinking that it may disable X-drive altogether and go to a 100% rear drive car? If that's the case, I can see some rear-wheel drive enduced oversteer in my future, but I'm guessing this is not the case. I need to go out and experiment a bit