How would you feel if you couldn’t drive faster than 80, or couldn’t raise the volume on your car radio above a certain point?  OK, maybe you wouldn’t care so much, but your teenage son or daughter might.  Ford is going to introduce a new system, MyKey, on its upcoming 2010 cars, starting with the Ford Focus.  It will enable parents to program a key such that certain “safety features” are enabled.  Such as the above.According to a Harris Interactive Survey conducted for Ford, MyKey appeals