viewvc and blame on props?

Hi

I was gonna quickly lookup who were editing svn:externals on
/repository/phpdoc/modules/doc-all/[1] but I can't seem to find
anything other then "author"[2] (I assume thats 'last edited') info..

Is this a limitation in viewvc/SVN or something that can be fixed?

-Hannes

[1] http://svn.php.net/viewvc/phpdoc/modules/doc-all/
[2] http://svn.php.net/viewvc/phpdoc/modules/#doc-all