Just as a random idea. For the situation that the MRT's can't reverse.
You could allow car-reset, and listen for a IS_CRS (car reset), and automatically assess a s/g penalty to that driver.
That allows a driver to recover, while giving them a penalty that simulates a pitstop. Of course on AX that won't work, so maybe a 30s penalty (upgraded to 45s if reset a second time).. or manually timing/removing s/g penalties on AX tracks.