I thought the problem was that when you order the posts in a forum by number of replies, the old ones come up on top. Using the advanced search like I described, you can get the zero reply posts, AND order by descending date, so the new ones will come up on top. When they get too old, you just stop browsing. You could even set the search to return only posts from let's say the last month? That way you will never even see those old closed threads.