Yeah.. This year in the Mid-West it was agreed that the F1 drivers would ref.
We each select a heat and then ref the same one each round. Then when it comes to finals, we split them up between us. Obviously the A final doesn't always a ref assigned, although we luckily had "H" this weekend.
This system is working so far with driver standards, although we need to crack down on the "fruity" language that comes from some of the drivers.