Wouldnt it be benifical to have a center diff? I mean, when you want power transfer differences front to rear, or even brake bias?

I dont know for sure if the full size, 1:1 4WD drift spec cars use the center diff. (That would be a common stock part for an AWD car) A true 4WD doesnt have a center diff by design, this provides even distribution of power to both front and rear axles for maximum traction for off road and probibly low traction situations. So, I figure the center diff wouldnt help much going forward as much as it would help with braking, being able to tune the way you enter and maintain the drift at high speed.