I say keep it:
I saying these things from an administrative position (I'm not a NASA admin but I am a businessman) as I have no problem with the rough and tumble. I've had contact racing in the past 3 years about 5 times. All but 1 was racing NASA, none were GTS cars. But I have seen a situation where the 13 worked. In MA we had a round track driver come into GTS and "rub" every car in the field for 3 weekends. He is a great guy and LOVES to race but had he been allowed to continue he would have emptied the GTS ranks. He has since fallen in line so I say it worked.
In this example, the stewards could not have used regular CCR rules to penalize this fellow? Why not ?
Was it trully a 13/13 or was it just what they called that penalty. There have been plenty of times drivers have gone home or missed races because of CCR penalties.
I know of at least two people who have gotten significant (year ending) penalties for re-occuring issues. I know of a couple that have had probation for further contact. (in GTS or not)
That said, how do you administer an out of class car (lets say spec944) that runs in the GTS group and hits people. He does not have a 13/13 rule in his class. I am sure that the insurance companies would not insure a mixed 13/13 class with non 13/13 classes if they are not willing to insure non-13/13 classes. And, if that is the only criteria that they are using for which groups to insure...