One cannot completely override traction control or yaw control on a 2011 either.
Beyond a certain yaw angle, even in offroad with advancetrac disabled, it'll still try to save you from yourself. Which has almost actually killed me on occasion. Thanks ford.
Same thing for traction control, it'll allow a certain amount of slippage, but beyond a certain wheel speed differential over x amount of time, it'll throttle back on its own.
Throw the rear end up on sturdy jack stands, throw it in gear, and hit the gas (redneck style !) if you don't believe me...
It will let you still do a mild drift at speed as in the above picture though.