Same issue that was addressed in your "Multipurpose Theme" i.e.
Under Pages (at the top), under Menus, Clicking on a Footer menu item brings up the dialog box for setting the Title / Type / URL, etc. - under the "Attributes" tab, - lower right field is "CSS Class" with the note "Enter a CSS class name to give this menu item a custom appearance." This does not appear to be functional. Similarly "hidden on front-end" or checking "External Link - Open links for this menu item in a new window" not working.