I have to respond to this, if you are not accelerating, it does matter where the system is putting the bias, you are no wheel drive. The bias only comes into play when you accelerate. The electronics needed to shift the bias are going to be a lot faster than the engine is going to be able to make power. There is no instant power with an engine. While it is fast, there is a delay, and in this delay, the computer will be able to look steering imputs, speed, throttle position and put the bias where the power will be able to be most used. In a drift, you are not fully using the power at hand, spinning tires=lost traction=not accelerating to your fullest potential.