We currently don't have a menu item type to launch the SCLogin modal popup window. It is in our issue tracker, but I don't have a timeframe on when we will be adding this functionality.
As a temporary solution, we do recommend using Modules Anywhere to accomplish what you're looking for. Please see our SCLogin Common Support Questions at
www.sourcecoast.com/sclogin/documentatio...n-support-questions/ for "How can i open the SCLogin Modal Popup with a regular link?". Let us know if you have any issues following this approach.
-Melissa