well the DCCD control doesnt ACTUALLY move power in the way of front wheels and rear wheels. im 99% sure that the actual power ratio and torque split remains the same.
you are actually changing the way the differential locks. so compared to "LOCK" mode where the diff locks and is supposed to not allow the wheels to spin at different rates, when it is full open, it allows the tires to spin much more freely, but the power is the same to each wheel
our cars will never be able to drift like your friends 240 SX because of the all wheel drive. at least on tarmac.
on dirt, snow, wet roads, etc. the diff settings will allow for a lot of difference in wheel spin to drift well.
hope this helps. and if im wrong. which im sure im not 100% right, someone please correct me.
--------I am pretty sure the DCCD does adjust where the power goes as far as the wheels go. 05 and down it can go to 80% back 20% front, but my 07 can only go to 65% rear and 35% front which is not very good. It was pouring outside today and my STi has 380 horsepower at the wheels and even after a 4500rpm launch the wheels catch in about a second, if not less. and if I floor it in first i get no spin at all even on wet ground with ultra high performance summer tires on...