--- ucreate.module.orig	2009-01-12 19:34:47.000000000 -0500
+++ ucreate.module	2009-06-30 01:06:15.000000000 -0400
@@ -123,6 +123,14 @@ function ucreate_settings_form() {
     '#options' => $options,
     '#default_value' => variable_get('ucreate_default_roles', array()),
     );
+
+  $form['ucreate_excluded_roles'] = array(
+    '#title' => t('Excluded roles'),
+    '#description' => t('Roles a new user are NOT allowed to be assigned.'),
+    '#type' => 'checkboxes',
+    '#options' => $options,
+    '#default_value' => variable_get('ucreate_excluded_roles', array()),
+    );
   // @todo: personalize e-mail message.
   return system_settings_form($form);
 }
@@ -150,6 +158,16 @@ function ucreate_user_form() {
     $options = user_roles();
     unset($options[1]);
     unset($options[2]);
+
+    // remove excluded roles from options
+    $excluded_roles = variable_get('ucreate_excluded_roles', array());
+    foreach ($excluded_roles as $key=>$val) {
+      if (!$val) {
+        unset($excluded_roles[$key]);
+      }
+    }
+    $options = array_diff_key($options, $excluded_roles);
+
     $form['roles'] = array(
       '#title' => t('User roles'),
       '#type' => 'checkboxes',