first import

sites/all/modules/admin_menu/admin_devel/admin_devel.info

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+name = Administration Development tools
+description = Administration and debugging functionality for developers and site builders.
+package = Administration
+core = 7.x
+scripts[] = admin_devel.js
+
+; Information added by drupal.org packaging script on 2013-01-31
+version = "7.x-3.0-rc4"
+core = "7.x"
+project = "admin_menu"
+datestamp = "1359651687"
+

sites/all/modules/admin_menu/admin_devel/admin_devel.js

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+(function($) {
+
+/**
+ * jQuery debugging helper.
+ *
+ * Invented for Dreditor.
+ *
+ * @usage
+ *   $.debug(var [, name]);
+ *   $variable.debug( [name] );
+ */
+jQuery.extend({
+  debug: function () {
+    // Setup debug storage in global window. We want to look into it.
+    window.debug = window.debug || [];
+
+    args = jQuery.makeArray(arguments);
+    // Determine data source; this is an object for $variable.debug().
+    // Also determine the identifier to store data with.
+    if (typeof this == 'object') {
+      var name = (args.length ? args[0] : window.debug.length);
+      var data = this;
+    }
+    else {
+      var name = (args.length > 1 ? args.pop() : window.debug.length);
+      var data = args[0];
+    }
+    // Store data.
+    window.debug[name] = data;
+    // Dump data into Firebug console.
+    if (typeof console != 'undefined') {
+      console.log(name, data);
+    }
+    return this;
+  }
+});
+// @todo Is this the right way?
+jQuery.fn.debug = jQuery.debug;
+
+})(jQuery);

sites/all/modules/admin_menu/admin_devel/admin_devel.module

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+<?php
+
+/**
+ * @file
+ * Administration and debugging functionality for developers and site builders.
+ */
+
+/**
+ * Implements hook_form_FORMID_alter().
+ */
+function admin_devel_form_admin_menu_theme_settings_alter(&$form, &$form_state) {
+  $form['actions']['wipe_rebuild'] = array(
+    '#type' => 'submit',
+    '#value' => t('Rebuild system links'),
+    '#submit' => array('admin_devel_form_admin_menu_theme_settings_alter_rebuild_submit'),
+    // @todo Not necessarily ready for mass-consumption yet.
+    '#access' => FALSE,
+  );
+}
+
+/**
+ * Form submit handler to wipe and rebuild all 'module' = 'system' menu links.
+ */
+function admin_devel_form_admin_menu_theme_settings_alter_rebuild_submit($form, &$form_state) {
+  // Delete all auto-generated menu links derived from menu router items.
+  db_delete('menu_links')
+    ->condition('module', 'system')
+    ->execute();
+  // Rebuild menu links from current menu router items.
+  menu_rebuild();
+
+  drupal_set_message(t('System links derived from menu router paths have been rebuilt.'));
+}