you can edit the ESS MENU directly and check instead of making a z one read here
http://scn.sap.com/community/erp/hcm/employee-self-service/blog/2012/05/31/tips-recommendations-for-customizing-ess-menu-wd-abaphttp://scn.sap.com/community/erp/hcm/blog/2012/03/29/launch-pad-customization-in-sap-essan-overview or use the BADI HRESS_MENU to hide the links, its pretty straightforward.