Yes, no limits and the list will get huge very quickly. With over 1000 cars to choose from (of which only 180 are worth a damn) and thousands of possible tuning variations there is absolutely no way to compare the data in a bench thread that is useful.
So... I'm thinking a bench thread with limits is just a time trial. We should do a time trial series. Rick ran a great series for us in Prologue. Someone has come forth and volunteered to do it here. I'm going to lock them in a cage and let them fight it out.
I think it makes much more sense to pick a specific list of cars that can change periodically and run them on a specific list of track that can change periodically. Keeps it fresh and keeps it manageable.
And run on S tires.
For myself, I prefer lap times that don't go far above 2 minutes, although I won't rule out the long tracks. It's one thing to blow a lap and know you're only 30 seconds from the finish line to start again. It's another if you've got 4 minutes left on your lap.
I'll stop with the suggestions. Our volunteer may have ideas of his own. Good ones.