Getting it to default off, may be as simple as changing the actual switch backing. Something tells me its part of the computer, and that a custom chip will be in order, if you want it to work at all.
I assume there is some liability in selling a car with traction control that you have to set yourself. If you think about it, it makes sense. My right foot is all the traction control I need.

__________________
1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13