--- includes/callback_add_fulltext.old.inc	2011-02-25 15:06:44.000000000 +0100
+++ includes/callback_add_fulltext.inc	2011-02-25 13:44:40.000000000 +0100
@@ -49,10 +49,62 @@ class SearchApiAlterAddFulltext extends 
         '#default_value' => $field['fields'],
         '#attributes' => array('class' => array('search-api-alter-add-fulltext-fields')),
       );
+      if (empty($this->options)) {
+        $form['fields'][$name]['note'] = array(
+          '#markup' => '<p>' . t('Note: This is an automatically generated field, pre-configured to aggregate all fields with text content. You can change this configuration to your needs.') . '</p>',
+          '#weight' => -5,
+        );
+        $form['fields'][$name]['name']['#default_value'] = t('Aggregated fulltext field');
+        $form['fields'][$name]['fields']['#default_value'] = $this->getTextFields($this->index->entityWrapper(), $fields);
+      }
     }
     return $form;
   }
 
+  /**
+   * Helper function that returns all fields that have the original type "text".
+   * Copied from search_api_extract_fields().
+   */
+  protected function getTextFields(EntityMetadataWrapper $wrapper, array $fields, $pre = '') {
+    $ret = array();
+    $wrapper_info = $wrapper->info();
+    while (search_api_is_list_type($wrapper_info['type'])) {
+      $wrapper = $wrapper[0];
+      $wrapper_info = $wrapper->info();
+    }
+    $nested = array();
+    foreach ($fields as $field => $info) {
+      $pos = strpos($field, ':');
+      if ($pos === FALSE) {
+        try {
+          $property_info = $wrapper->$field->info();
+          if (search_api_is_text_type($property_info['type'])) {
+            $ret[] = $pre . $field;
+          }
+        }
+        catch (EntityMetadataWrapperException $e) {}
+      }
+      else {
+        list($prefix, $key) = explode(':', $field, 2);
+        $nested[$prefix][$key] = $info;
+      }
+    }
+
+    foreach ($nested as $prefix => $nested_fields) {
+      if (isset($wrapper->$prefix)) {
+        $ret = array_merge($ret, $this->getTextFields($wrapper->$prefix, $nested_fields, $pre . $prefix . ':'));
+      }
+      else {
+        foreach ($nested_fields as $field => $info) {
+          if (search_api_is_text_type($info['type'])) {
+            $ret[] = $pre . $field;
+          }
+        }
+      }
+    }
+    return $ret;
+  }
+
   public function configurationFormValidate(array $form, array &$values, array &$form_state) {
     foreach ($values['fields'] as $name => $field) {
       if ($field['name'] && !$field['fields']) {