User experience for private instance signup

Right now if admin disable "allow anonymous user access" (restrict mode), everything is locked down except for login page. There is no way for user to contact admin at all for request access as login page does not have side bar (contact admin link is in the side bar -> more page).

Implementation:
Not to lock down Home page, and make it clear that the Home page content is available to anonymous users (there's concern on visibility of the content in home page).