Option to mark all items in feed read when switching feeds

As a long-time Feeddemon user, this is an option that I really appreciate. I can select a feed, browse over the items in the feed, and then the action of selecting a new feed marks all the items in the previous feed as read. Obviously this should not be a default behavior, but for those of us with hundreds of feeds to read who want to move through them with the minimum number of clicks possible, it’s a really nice feature.