Thinking out loud here, why don't we have a rating system for drivers? For example, a panel of trusted slalom officials in the US who might consist of drivers (and it doesn't have to be drivers) such as Chad Scott, Chris Eller, etc., who could rate (but not necessarily RANKING) the drivers much like our skier rating Level 1 through Level 10, being based on things like minimum deviation at certain line lengths.
Somewhere along the way, the system is kind of broken. There are drivers who think they're role is to help the skier (I personally think that has a place, but somewhere there has to be a cut off). I'm sure I'm part of the problem here, but I have helped skiers run a -28 for the first time in a tournament.
One of the main reasons I didn't maintain any driver rating is the maintenance and the promotion system for drivers. I don't go a lot of tournaments but almost every day I drive, I get to drive -38, -39, -41 and sometimes -43. My problem is that if I'm driving -15 through whatever at 21mph to whatever, my attention span is very short after a few skiers whereas if I'm driving-32 to -41, I focus much better most of the time. I don't see how drivers can stay in that seat for hours at a time, hats off to them that can.