Whenever I am instructing a new student on the buddy box I keep my radio on high rates (need that to recover in an emergency), but I definately keep the buddy radio (the trainee) on low rates. The low rates help them from overcontrolling at first. As they start getting a better feel for the sticks with more time on them, I slowly turn up the low rates. This way they get more control as they learn not to over control.

Definately low rates for a beginner.