For what it's worth: indeed, there was an extension that (supposedly)
provided the legal disclaimer I wanted, but it had no documentation,
the author did not respond to email, and I couldn't get it to work.
So I made my own extension:
http://typo3.org/extensions/repository/view/link_disclai
Hello all. I assist in the operation of a couple of Typo3 sites run
by nonprofit organizations. Because of the industry the
organizations are part of, and because of their ties to the U.S.
government, we have now been instructed that all links from our site
to external web sites need to p