If you go to the security Assist page manager you can add security to all of the pages at once and force login. (of course you would have to leave the login page available).
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.