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I am using Mozilla Firefox (browser) with the Sage extension (feed agregator) which has a cool little function that will parse through a page and look for the RSS feed. I found that it doesn't work with XOOPS sites or at least not on mine and XOOPS.org.
I'm not sure if what I am suggesting is proper XHTML but this hack works for the feed auto detection now. I just added the line below to the head theme.html but it should probably be more part of the core than a theme level hack.
<link rel="alternate" type="application/rss+xml" title="RSS2" href="<{$xoops_url}>/backend.php" />