add drupal_alter('commons_bw_create_all_widget', $group, $items); in commons_bw_create_all_widget

It seems the list of items for the group add content does/can not only provide items based on permission - either site wide or group specific.

I have different group types available for users with different roles. I have set up the permissions at the site and group level for the different group types and it works where if the user clicks to add a type they don't have perms for, they get an access denied. However I don't want the create link to show up at the group level.

Could the ability to alter the items that should appear in the create links be added to:

/**
 * Provides a styled content creation dropdown widget for the 'all'
 * tab of the group homepage browsing widget.
 */
function commons_bw_create_all_widget($group) {
  $links = array();
  // Collect definitions from implementing modules.
  $items = module_invoke_all('commons_bw_create_all_widget', $group);
  drupal_alter('commons_bw_create_all_widget', $group, $items);