Currently, we don't have such add-on or feature. If you have just a few of allowed domains/URLs, then there could be an easy way to program an addition to bb_codes.php which would allow to "hyperlink" such URLs disregarding the $userUrlsAllowed rule. Also, there is a way to add kind of special BB-code button(s) for such a few domains, introducing just a new BB codes which would work for everyone incl. guests.
However if you would like to have a rich library of such URLs, there would be more complicated code/add-on which we don't have at the moment. But I could think it of and you could be the proud sponsor of it in terms of our regular fees.