I made an amendment to fix a bug in the output of this (created via shortcodes.php in the lib directory).
The plugin couldn't read amperhsands (&) in the RSS feed, so that when I was trying to get it to read RSS feeds of categories created by WordPress it was simply returning the whole lot.
$rss = @fetch_rss( $id );
$rss = @fetch_rss( str_replace('\&\#\3\8\;','&',$id) );
(without the backslashes)
And it works properly. Obviously this is a quick'n'dirty fix, and you may want to loo at a more elegant way to handle ampersands in the RSS feed.