I have a couple points of data, one is direct and the 2nd is anecdotal.
I can say for certain that the software and firmware developers count on a specific set of tire parameters, including all the physical aspects of each (F + R) tire. Name a tire parameter, and it will be in a coded lookup table. The state machine running executing on the microcontroller/ processor is fetching each variable parameter many time per second, depending on environmental conditions (tempreature/ air pressure/ lean angle/ and yes wheel speed differentials, etc). Fixed parameters are typically fetched once per bootup, like wheel size (tho, I'm not sure about thinks like sidewall height. They're relatively fixed, but with tire flex during rotation, and lean angle, they may make it a variable).
The processor fetches from the looup table depending on all these parameters, and sorts out the branch decision logic, in code, based on the moment by moment conditions. All this factors into the TC experience you get on the cycle.
Bottomline: The point is, change any of those parameters, and you'll change the behavior of the TC.
Anectotally, last month Ducati was invited to a superbike shootout in Motorcyclist magazine (to provide their new Panagalli <sp>). The magazine staff required that each cycle in the shootout be fitted with the exact same tires.
Ducati refused to fit anything but their spec'ed tires, and they sited as the reason this very thing, that the TC parameters would be changed to be something other than what they designed for, in code.
Software becomes important...
2012 Blue ZX-14R, Cox rad guard, Skene Design P3 Lighting, Knight Design 1" lowering pegs, Grip Puppies, BrakeAway, Cortech Sport tailbag, GSG MotoTech Frame sliders, Stebel Compact horn.