> but also to have links to other hosts be like this:
>  <http://someotherhost/foo.cgi?q=45>  -->
> <http://someotherhost/foo4B54.html?q=45>
> AND NOT
> ../someotherhost/foo4B54.html?q=45

Humm, not with default settings.

Do you really need this feature ? Couldn't the external page feature (ie.
rewrite external links so that they point to a single page, which may embed
javascript) be sufficient ?
If not, the only way is to develop a very small plugin, whose aim would be to
rewrite the link, using a callback similar to the save-name callback. But this
is not the easiest way to go.