[Lokean]

Correct me if I'm wrong, but there's no real troll population to speak of on these forums, right?

With that in mind, why not create a user ID called something appropriate ('MP_Updates'?) and make a topic 'New games' in the sticky list. Give out the login and password to the more trustworthy and well known personalities on the forums and ask them to update it when they've got the time.
People can post new games to the sticky (or send PMs) and the trustees can go through them every so often and update the top post. There'll probably be circumstances where a game doesn't get put on the list for a day or two, or circumstances where a full game isn't taken off, but as long as links are provided to the posts for each particular game people will be able to check for themselves, too.