Ah sorry there is some outdated info in the readme, no need to modify cms_front.php
To display an accordion menu you can use the special tag {menu_accordian,0,0} in your page template. You can replace first 0 if needed with a parent category id. So if you had a category called shop and that had sub categories you could put the category id of the shop category and it would just menu those sub categories. It explains this tag near the top of the readme under Page Template Tags.