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I too am unaware of a mod that would do this automatically. But it's really more of an administrative issue, since the only thing stopping people from bumping threads is your rules and strict enforcement of them. So create a new usergroup "Sponsors" or something and allow those members to bump.

But I don't think it would fool members for long, and not at all if there were an auto-bump. I mean, after they click on the first 10 threads only to find no new material there, they would get wise and complain and stop clicking.