I don't believe we have a specific UGM role for this behavior. However, you can definitely restrict who has access to create a strategic brief in the UI by wrapping the navigation item with a security profile evaluator. Its just a configuration setting inside the MenuConfig-Extensions.xml file. Out of the box you restrict it to specific groups or you can even put in your own custom class to determine when the create new option appears. You can learn more about this in the Navigation Configuration Guide thats part of the extensibility pack release.