Apples and oranges. Rate of fire is at the heart of the NFA rules on machine guns.
You do sound like a "never give and inch guy." Believe me, I don't want to give an inch on anything because as a libertarian, I want the government to keep its filthy paws off of everything apart from national defense, interstate commerce, and a select few items. However, this to me is the least painful inch to give.
so you really do want to give an inch, you are willing to give them what they want? your a leftist compromiser? ok, now we know.