I read earlier that you were wondering how vBulletin has this feature installed as default. I looked into this and discovered that if you set the usergroup to view the forum and other's thread (set to yes) then set view thread content to (no) then it'll let guests view the thread titles without getting access to the content itself. As for the nice message, one way to fix that would be to look up phrases that contain a part of the default message, then changing that message to make it more pleasing to the eye.
But thanks for the hack anyway, although I learned it's not needed, if it wasn't for this hack, I wouldn't have thought about giving guests this option.
Domokun
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