diff -ruN /Users/titouille/Downloads/realname/realname.admin.inc ./realname.admin.inc
--- /Users/titouille/Downloads/realname/realname.admin.inc	2014-02-23 10:19:10.000000000 +0100
+++ ./realname.admin.inc	2014-06-11 17:47:14.000000000 +0200
@@ -26,6 +26,19 @@
     '#dialog' => TRUE,
   );
 
+  $p = ctools_get_plugins('entityreference', 'selection');
+  $plugins = array();
+  foreach ($p as $name => $plugin) {
+    $plugins[$name] = $name;
+  }
+  $form['realname_entityreference_plugins'] = array(
+    '#type' => 'checkboxes',
+    '#title' => t('Realname entityreference plugins disabled'),
+    '#default_value' => variable_get('realname_entityreference_plugins', array()),
+    '#description' => t('On which handler would you like to disable realname autocomplete instead of standard autocomplete ?'),
+    '#options' => $plugins,
+  );
+  
   $form['#submit'][] = 'realname_settings_form_submit';
   return system_settings_form($form);
 }
diff -ruN /Users/titouille/Downloads/realname/realname.module ./realname.module
--- /Users/titouille/Downloads/realname/realname.module	2014-02-23 10:19:10.000000000 +0100
+++ ./realname.module	2014-06-11 17:58:50.000000000 +0200
@@ -326,11 +326,22 @@
  * for existing users based on their generated real names.
  */
 function realname_autocomplete($field_name, $entity_type, $bundle_name, $string = '') {
+  $field = field_info_field($field_name);
   $instance = field_info_instance($entity_type, $field_name, $bundle_name);
   $matches = array();
 
   // User entityreference autocomplete fields.
   if ($instance['widget']['type'] == 'entityreference_autocomplete' && !empty($string)) {
+    $_dis_plugins = variable_get('realname_entityreference_plugins', array());
+    $dis_plugins = array();
+    foreach ($_dis_plugins as $name => $value) {
+      if($name === $value)
+        $dis_plugins[] = $name;
+    }
+    if (in_array($field['settings']['handler'], $dis_plugins)) {
+      entityreference_autocomplete_callback_get_matches('single', $field, $instance, $entity_type, 'NULL', $string);
+      return;
+    }
     $query = db_select('users', 'u');
     $query->leftJoin('realname', 'rn', 'u.uid = rn.uid');
     $query->fields('u', array('uid', 'name'));