John Citizen - This sort of thing hacks me off as well. But I'd suggest that you give the unconfident knob control with the appropriate phrase. On the ground, explain why you did and if he doesn't buy it, let him fly every sector. Then complain to the appropriate person AND do the safety paperwork. And it won't only be you who they do it to. People like this have to be retrained until they stop interfering. The more you allow them to continue, the worse they'll get.
PM