Ignore Thread Feature

Some of the forums that I like to read often have threads that don't interest me and that have a lot of activity. Every time there is a new post to a thread, it marks the thread as having unread items and bumps it to the top of the forum. It also marks the forum as having unread items. I would like to be have an ignore thread feature that that would make it so that threads that I have marked to ignore would never display new activity. The ignored threads would still be available; they just would never draw attention to themselves.