I'm not sure a UK based sub-forum would attract much traffic from actual Americans.
What makes TMF great, aside from the technical info, is the enthusiasm shown for the mini by young people.
Most mini people in North America are old folks, as seen on minimania, who are mostly stubborn people with outdated information. And also not the type of people who would stray on to any part of the internet based outside the greatest country on earth.
Like the person who insisted there were NO JOHN COOPER WORKS till that company in Germany had the option