That’s not too far off from how Darlington and a few other tracks work. If you “ride the cushion” of air between the car and the wall you can drive faster than being a few inches away from the wall or rubbing the wall.
I definitely don't think you want people doing this every race, but you could leave it alone for now and see if that becomes an issue before worrying about it too much. It's possible that now that people know it's a possibility, they'll simply defend the outside line out of the last corner, which could shut it down fairly effectively.
Running the cushion is not what Ross Chastain did. At Darlington and a few other tracks you ride as close as you can to the wall without much more than the occasional tap. If your paint is scraped up but the body panels aren’t bent you did it correctly. Many years ago they used to put 2x4s in the fender walls to protect them but now this requires car control.
