The correct way without disabling ABS is to get a switch between the ignition supply wire to the steering sensor.
All you need is cut the red/black wire on the Drivers Side J/B, Connector 1A, Pin 4:
and put the switch (nc) in between, like the drawing.
More info can be found here: http://my.is/forums/f88/vsc-disable-344712/#post6129044