this may not be the best place to post this, but I'm not sure where else to. If you're like me and you're managing a site still on Drupal 5, it's an easy implementation.
1. change the version info in the info file to 5. It appears in a few places so make sure you get them all.
2. The only function used in the version 6 version of this module that is not available in Drupal 5 core is drupal_match_path. This is a simple function which has no other dependencies, so all you have to do is paste that function from the core into the module code. As of this writing, this is the code:

function drupal_match_path($path, $patterns) {
  static $regexps;

  if (!isset($regexps[$patterns])) {
    $regexps[$patterns] = '/^(' . preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/', '/(^|\|)\\\\<front\\\\>($|\|)/'), array('|', '.*', '\1' . preg_quote(variable_get('site_frontpage', 'node'), '/') . '\2'), preg_quote($patterns, '/')) . ')$/';
  }
  return preg_match($regexps[$patterns], $path);
}

That's it - you can now install and use the module in Drupal 5 without a problem.

Since it's such a simple change, perhaps a v. 5 of the module could be made available?