Those two thread have some good information...I had to do some searching, since I am not real farmiliar with the traction assist on these cars, as I have never owned an MN12 equipped with it...hell all my previous MN12s where non-ABS cars, so even that is new to me on these cars.
Anyway, it looks like traction assist cannot be disabled with a tune on these cars, because it seems to be a self contained somewhat unque system, or at least, operates differently than the more modern systems.
Traction assist on the 99+ mustangs, in my experiances works pretty good, and can be disabled with a tune, and I think there is a module called trac-adapt or something that makes the system default to off when the car is started...if that system could be adapted to our cars, which with enough donor wiring and such, I'm sure it could...but I am getting off topic.
Looks like you have two options. Remove fuses, and you will not have ABS or TA, which, might not be that bad, if you are used to not having ABS.
Or, swap out the ABS stuff on your car to a setup from an ABS equipped, non TA equipped car.