Well I found the answer. There is no way add menu items to the sitemap's contextual menu. The source code for the sitemap's contextual menu is contained in /concrete/js/ccm_app/sitemap.js. However the code that actually gets executed is contained in /concrete/js/ccm_app.js. Somehow all the js code is minified and put into ccm_app.js. Since it is all hard coded There is really no way off adding to the menu unless you want to hard code addition links. Which is probably a bad idea. Hopefully in the future adding menu items will be possible.