Altering user data passed to Disqus SSO

Has anyone had success passing drupal user variables (such as profile fields or user role) to a custom Disqus theme?

Disqus lists their comment variables but i don't see how they correspond to what's being passed to Disqus in the code below (lines 118 to 138 of disqus.module)

    // Inject the user data if it's available.
    if ($user->uid > 0) {
      $data['id'] = $user->uid;
      $data['username'] = $user->name;
      $data['email'] = $user->mail;
      $data['url'] = url('user/' . $user->uid, array(
        'absolute' => TRUE,
      ));

      // Load the user's avatar.
      $user_picture_default = variable_get('user_picture_default', '');
      if (isset($user->picture) && !empty($user->picture) && is_numeric($user->picture) && $file = file_load($user->picture)) {
        $data['avatar'] = !empty($file->uri) ? $file->uri : NULL;
      }
      elseif (!empty($user_picture_default)) {
        $data['avatar'] = variable_get('user_picture_default', '');
      }
      if (isset($data['avatar'])) {
        $data['avatar'] = file_create_url($data['avatar']);
      }
    }