<?php
$res_id = 1; // заменить на свой id заглушки
$uri = $modx->makeUrl($res_id, '', '', 'abs');
if ($modx->user->hasSessionContext('mgr') || $modx->user->isMember('Administrator')) return;
if($_SERVER['REQUEST_URI'] == $uri || $_SERVER['REQUEST_URI'] == MODX_MANAGER_URL) return;
$modx->sendRedirect( $uri );