Add form processing events:

user_add_form_admin            admin adding a user
 user_edit_form_admin           admin editing a user
 user_add_form_admin_completed  successfully added a user (admin)
 user_edit_form                 user editing their own settings
 user_edit_form_completed       successfully edited a user (admin and user editing own settings)

modules/user/controllers/admin_users.php

@@ -48,8 +48,10 @@ class Admin_Users_Controller extends Controller {
         $desired_locale = $form->add_user->locale->value;
         $user->locale = $desired_locale == "none" ? null : $desired_locale;
       }
-
       $user->save();
+
+      module::event("user_add_form_admin_completed", $user, $form);
+
       message::success(t("Created user %user_name", array("user_name" => p::clean($user->name))));
       print json_encode(array("result" => "success"));
     } else {

modules/user/controllers/users.php

@@ -39,6 +39,7 @@ class Users_Controller extends REST_Controller {
         $user->locale = $desired_locale == "none" ? null : $desired_locale;
       }
       $user->save();
+      module::event("user_edit_form_completed", $user, $form);
 
       message::success(t("User information updated."));
       print json_encode(

modules/user/helpers/user.php

@@ -36,6 +36,8 @@ class user_Core {
     $group->input("url")->label(t("URL"))->id("gUrl")->value($user->url);
     $group->submit("")->value(t("Save"));
     $form->add_rules_from($user);
+
+    module::event("user_edit_form", $user);
     return $form;
   }
 
@@ -56,6 +58,8 @@ class user_Core {
     $group->submit("")->value(t("Modify User"));
     $form->add_rules_from($user);
     $form->edit_user->password->rules("-required");
+
+    module::event("user_edit_form_admin", $user);
     return $form;
   }
 
@@ -75,6 +79,8 @@ class user_Core {
     $group->submit("")->value(t("Add User"));
     $user = ORM::factory("user");
     $form->add_rules_from($user);
+
+    module::event("user_add_form_admin", $user);
     return $form;
   }