Not an INFORMED opinion, but I've been reading a lot of threads on suspension lately (trying to figure out what I want to do as well...)

Torque split is 50/50, BUT weight distribution (static) is 60/40. I would assume, that (for drag racing; maybe autoX as well??) you would want SOME weight transfer to get torque, AND weight as equal as posible at all four wheels. Mind you, this only applies under heavy (ie: wheelspinning) acceleration, as far as I can see.

Now, I'll have all kinds of time to talk about DSMs, because I won't be busy fixing mine!