Add a permission entry to the module for better administration.

There should be a extra permisson for the config page of this module.
Currently there is the 'access administration pages' witch is a pretty basic permission.

<?php

/**
 * Implementation of hook_menu().
 */
function realname_registration_menu() {
  $items = array();

  $items['admin/config/people/realname_registration'] = array(
    'title' => 'Realname registration',
    'description' => 'Administer settings for Realname registration.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('realname_registration_settings_form'),
    'access arguments' => array('administer realname registration'),
    'file' => 'realname_registration.admin.inc',
   );

  return $items;
}

/**
 * Implements hook_permission().
 */
function realname_registration_permission() {
  return array(
    'administer realname registration' => array(
      'title' => t('Administer settings for realname registration'),
      'description' => t('This will allow to access the config page of realregistration.'),
    ),
  );
}
?>