This is Drift Mode, and it's exactly what it sounds like -- a setting that's so fun, safety advocates in Australia want to ban it before it reaches the Gold Coast, lest Aussie drivers start filling supermarket parking lots with tire smoke. It sends up to 70% of its power to the rear wheels -- specifically to create oversteer, if you're aggressive enough. It's called torque vectoring, and it makes driving sideways laughably easy. Within seconds, everything you think you've learned about drifting from the Fast & Furious movies is instantly applicable. Crank the steering wheel, mash your right foot to the floor, and hold whatever angle you want with the wheel.
The only real caveat is that your over-exuberance can sometimes result in a temporary deactivation of the system while it cools off. If you get to that point, though, you'll probably have to stop for new tires anyway. Truly, it's a tire salesman's dream.