New BBCode tag for linking to SVN revisions?


Would it be possible to add a new BBCode tag for linking to SVN revisions to the forums? Something like:
where $repo is one of base,doc,ports,... (defaulting to ports if missing) and $revision is the SVN revision to link to.

For example [svn=ports]409799[/svn] would link to and be shown as Ports r409799.

This would complement the existing pr tag.
I think we could do something like this, although maybe it should be called revnumber or just rev, which is not Subversion-specific and is consistent with our DocBook markup.

But how bad do we need it? People posting links to specific revisions is pretty rare at present. In fairness, that might be due to the hassle of finding the URL and copying it in.