[kh99]

Well, I tried it but unfortunately I don't see a way to access the image url without changing the code or creating a plugin. So, I created this plugin using hook location rssposter_parse_rss:

$handled = array('link', 'description', 'title', 'id', 'guid', 'pubDate', 'date', 'enclosure_link', 'enclosure_href', 'content', 'content:encoded', 'author', 'dc:creator');

if (!in_array($field, $handled))
{
   $parts = explode(':', $field);
   if (count($parts) > 1)
   {
      $att = array_pop($parts);
      $f = implode(':', $parts);
      if (is_string($item[$f][$att]))
         $handled_value = $item[$f][$att];
   }
}

If you create that plugin, then you should be able to get the image url using {feed:enc:enclosure:resource}.