How to modify a thread's visibility
 

Hey all,

I am looking into adding in a functionality where an admin or moderator have the option to change a thread's visibility, such that it will only show for members (registered users) and not guests. I have looked around and found a couple of mods, but none of them do what I need. I can tweak them, but my understanding of the process flow of vBulletin impedes my ability to modify them correctly. Would you guys know of a mod that does exactly what I need, or if not, can you explain to me how one could achieve such a feature through coding? What hook do I use, and so on?

Thanks,
S