I need the ability for instructors to sign up and add their courses, without access to the rest of WordPress dashboard. I don't believe this is default CoursePress behaviour - so am looking at achieving this by utilising the User Role Editor plugin. However, course instructors will then have edit/write access to other instructors courses. Is there a way to lock this down? What would you suggest in order to keep this secure, and the user experience as intuitive as possible.