Peri, unfortunately there is no easy way for me to do that right now, but what I can suggest is that you watch the unread status in the background of the thread list (see attached). The ones that have a white background are either old threads or threads you have already read, so you can safely ignore them.
Also, as NAS progresses and we get a lot more threads in that category, I think the old ones will be less of an issue.
Sorry that I don't have more of a solution. In the long term I think we should have some sort of warning about very old threads because they can sometimes be a problem in other contexts too (spammers reviving old threads, for example).
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