In the Williams Technical Guide, it has a section on setting the front suspension geometry and tracking etc. It makes an interesting point, and if true, could help me a lot with setting mine up:
It says...
With the steering lock applied there is still a certain amount of play in the steering wheel. The steering 'centre point' is obtained by turning the wheel slowly to the left (left hand stop)
After this it then goes on to describe you can set the tracking at this point.
So I guess, if this is true, you could do as it says, remove steering wheel, set it to straight ahead and have the wheels tracked at straight ahead...right?