Oh right so you want to server pages to the world but stop access to the wamp home page. Right I get it now.
The best way to do that is to leave WAMP set to Offline and create a Virtual Host for each site that you want to be visible to the world.
This way you can leave the c:\wamp\www security set to only 'allow from localhost' but the virtual hosts can be 'allow from all'
Heres a tutorial on how to setup virtual hosts:
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forum.wampserver.com]