Of course "Zap" is a sock puppet, while he doesn't mock the system though (too much at least) he's not a problem. As for the idea, the simplest of methods would be to just allow one forum for Guests (That's non-members and people that aren't signed in) to post. The problem with this is it would require a CAPTCHA to make sure that it didn't get filled by spambots. In essence if it was to be done, perhaps it would be best to be written, stylised and followed like a site Science Project. (In this case Psychology).