The Bosch Motronic hardware that runs the Porsche management system has its roots back in the F1 turbo days and is the most developed, advanced, and widely used commercially available management system available to manufacturers today. It is far and away a more advanced and modular platform than the Hitachi architecture in the GTR
As for the torque split, having just dynoed GTR vs 997 Turbo recently (as you well know Fungoolie) the Mainline AWD chassis dyno logged and plotted the way the AWD systems in each car work, and their response in a WOT transient at identical acceleration rates was similar, VERY similar, I can even graph them here for you if need be.
Facts are, the best electronics in the world - which Porsche have - is not going to overcome the fact the physics that the current 911 is still based on the poorly balanced Fuhrers Peoples Car of the 1930s. This is why 911s time has been, and is gone