One of the problems I have always had with ER PAX is the fact that some folks would run one class for trophies, then switch to the easier class, or switch cars completely for PAX. My opinion is that if you should run the entire day in the same class, PAX and all...
I tend to agree with Iian's assessment, however, a true street tire class PAX, minus novices and regular Street Touring classes, is not a bad idea. It could even entice novices to leave novice class and enter T classes after a couple of novice events...