There are modules like wf-sections which can handle more categories, but they will be displayed only on the startpage of the module.
// Menu
$modversion['hasMain'] = 1;
$modversion['sub'][1]['name'] = _MI_TE_SMNAME1;
$modversion['sub'][1]['url'] = "submit.php";
// Menu
$modversion['hasMain'] = 1;
if (is_object($xoopsUser)) {
$modversion['sub'][1]['name'] = _MI_TE_SMNAME1;
$modversion['sub'][1]['url'] = "submit.php";
}