I seem to remember someone here posting some pics of their white QS's ceiling mounted with a longer mount than Axiom's, that simply screwed into the threaded insert. This was quite awhile back maybe in '04.
Found the post sadly the link to his pics are no longer working but the link the the mount is
http://www.racksandstands.com/asp/show_detail.asp?sku=OM0012&catid=12He said they worked great and that he contacted Omnimount about the weight issue and they said the 10lb rating was on the conservative side.