Many years ago I went to traffic court in California and heard the judge explain to some guy with a window tint ticket that there are different tint rules for factory tint vs. aftermarket tint. Essentially a car can be made with darker tint than can be applied afterwards.
BTW, this judge also threw out every window tint ticket that came before him. He felt it was more a case of racial profiling than a safety thing. Since every quy in the south bay court that day with a window tint ticket was hispanic, it sure looked like he was onto something.
And on the whole roll bar padding thing, your head is going to be just as busted if you hit sheet metal as if you hit a roll bar. So as long as your cage is tucked up tight to the body parts I don't see where an inch of padding here or there is going to make much of a difference in any type of serious wreck. But I realize I am in the minority on that opinion.