--- fb_app.admin.inc.orig	2012-01-12 13:15:08.000000000 +0800
+++ fb_app.admin.inc	2012-01-12 13:17:13.000000000 +0800
@@ -59,7 +59,7 @@ function fb_app_edit_form($form, $form_s
       'fba_id' => NULL,
       'id' => NULL,
       'status' => 1,
-      'data' => serialize(array('fb_app' => array('set_app_props' => TRUE))),
+      'data' => serialize(array('fb_app' => array('set_app_props' => TRUE, 'username_alter' => TRUE))),
     );
     //drupal_set_title(t('Create Facebook Application'));
   }
@@ -138,6 +138,13 @@ function fb_app_edit_form($form, $form_s
     '#description' => t('Synchronize Facebook settings for this application when you save this form.  Disable this if you have customized your callback URL, or other settings on facebook.com.  Also disable if another Drupal instance hosts the same application (i.e. with shared subdomain).'),
   );
 
+  $form['fb_app_data']['fb_app']['username_alter'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Alter Username with facebook'),
+    '#default_value' => isset($data['fb_app']) ? $data['fb_app']['username_alter'] : NULL,
+    '#description' => t('Check if you want to use the username from facebook.'),
+  );
+
   $form['buttons'] = array();
   $form['buttons']['submit'] = array(
     '#type' => 'submit',