Try an new approach to extending forms. Create an extend_form event. For the first attempt replace the comment_add_form and item_add_form events.

1 files changed, 7 insertions, 3 deletions

diff --git a/modules/recaptcha/helpers/recaptcha_event.php b/modules/recaptcha/helpers/recaptcha_event.php
index feedced4..7a0b4f58 100644
--- a/modules/recaptcha/helpers/recaptcha_event.php
+++ b/modules/recaptcha/helpers/recaptcha_event.php
@@ -18,9 +18,13 @@
  * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
  */
 class recaptcha_event_Core {
-  static function comment_add_form($form) {
-    if (module::get_var("recaptcha", "public_key")) {
-      $form->add_comment->recaptcha("recaptcha")->label("")->id("g-recaptcha");
+  static function extend_form($event_data) {
+    // @todo put into an admin interface
+    $config = Kohana::config("recaptcha");
+    if (module::get_var("recaptcha", "public_key") &&
+        in_array($event_data->id, $config["recaptcha"])) {
+      $input = empty($event_data->append_to) ? $event_data->form : $event_data->append_to;
+      $input->recaptcha("recaptcha")->label("")->id("g-recaptcha");
     }
   }