I simply added the NLS comment, not from what you posted, but just to post it.
As for the traction control question, how much power do you think you're going to make that necessitates traction control on an AWD vehicle? There's nothing wrong with the stock solution for this car; and with AWD, unless your Haldex is blown, you're not going to get the wheel spin differential needed to allow the traction control sensors to see if it's needed to intervene. (In the snow, I easily get all four wheels spinning without any traction control intervention)