Pete, you have a lot of answers here, but here's the one that works the best and was stated above.

Two things you can do to assure very stright problem free take off:

1) put a $50.00 gyro on the nose wheel steering servo. (all of my jets have this).
2) put the expo on nose wheel steering to 70% or more

The increased expo allows you to use all of the travel of the servo if it is necessary, yet softens the middle so much that you can steer very accurately. If you put rates on a switch and you are in a tough crosswind, and you need more steering, you will be totally screwed. I have done that before I learned the above, and damaged an airplane badly. I have roughly 1500 flights as per the above two recommendations and have never had a botched takeoff due to steering.