Re: ASR/Traction Control - questions..
I belive it is all controlled by the ABS pump. (IIRC, if you look at the ABS pump it should have "ABS" and "TCS" or "ASR" engraved in it.
In theory, you can remove that and replace it with a bog standard "ABS" version.
Please bear in mind that the above is an educated guess, please don't take it as accurate technical advice. Speak to a pro first.
....alternativly, unplug an ABS sensor. that will cause the system to fault and the ASR and ABS will never switch on (though you will have several permanent error lights).