Joomla 1.6+ doesn't like Itemids for external menu links. So when you enable SEF it will immediately strip those Itemids. The only solution is to run a database query and force an internal menu link so you can assign modules or so menu highlighting for example can be used. Please see below example query.
Code:
INSERT INTO `jos_menu` ( `menutype`, `title`, `alias`, `note`, `path`, `link`, `type`, `published`, `parent_id`, `level`, `component_id`, `ordering`, `checked_out`, `checked_out_time`, `browserNav`, `access`, `img`, `template_style_id`, `params`, `lft`, `rgt`, `home`, `language`, `client_id` ) VALUES ( 'MENUTYPE_HERE', 'TITLE_HERE', 'ALIAS_HERE', '', 'ALIAS_HERE', 'index.php?option=com_comprofiler&task=userslist&listid=LIST_ID_HERE', 'component', 1, 1, 1, COMPONENT_ID_HERE, 0, 0, '0000-00-00 00:00:00', 0, 1, '', 0, '{"menu-anchor_title":"","menu-anchor_css":"","menu_image":"","menu_text":1,"page_title":"","show_page_heading":0,"page_heading":"","pageclass_sfx":"","menu-meta_description":"","menu-meta_keywords":"","robots":"","secure":0}', 297, 298, 0, '*', 0 );
The above has a lot of replacements that would need taken care of such as menu type, title, alias, list id, and component id. However, it will give you an Internal menu link where Itemid can then be used while SEF is enabled. With CB 2.0 we'll be fixing the menu creation issues on J1.6+.