I have not done "the domain mapping trick." My blog is hosted here, and I have the domain mapping upgrade.
cathryn101, I know you don't want to lose traffic. I know the static page is a kludge and unprofessional. What I'm saying is, WP.com does not support this "domain mapping trick" and if you can't manage to work it on your own, you're probably going to be out of luck. As far as I can see, staff have no incentive whatsoever to facilitate that; quite the contrary, as it keeps people at WP.com longer.
@jennifer: the list of FAQ updates that could be requested is long indeed, but do they actually say that they support/facilitate it? From what I read here and in the other thread, it seems that all they say is, it's possible.