Disable outline information on node types not enabled for book outlines

modules/book/book.admin.inc

@@ -27,6 +27,15 @@ function book_admin_overview() {
  */
 function book_admin_settings() {
   $types = node_get_types('names');
+
+  // Patch http://drupal.org/node/502430:
+  $form['book_restrict_to_types'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Enforce Allowed Types Restrictions'),
+    '#description' => t('Restrict outline capabilities to only the enabled content types below, even with "administer book outlines" permission.'),
+    '#default_value' => variable_get('book_restrict_to_types', false),
+  );
+
   $form['book_allowed_types'] = array(
     '#type' => 'checkboxes',
     '#title' => t('Allowed book outline types'),