You definitely shouldn't have to hack the helper.php file
The SCLogin user menu option uses the standard Joomla menu system. If you want some links for registered users, you should add them to the menu that you've created in the Menu system and selected to display in SCLogin. If a menu item is only for a specific user group or you're using some other way to target menu items to a user, the SCLogin module should do that automatically based on the menu system.
I hope that helps, but if you need anything else, please let us know.
Thanks,
Alex