I’m not sure when it launched but the date range is an important feature. Two ways to make it more useful:
- You should be able to keep the range across all feeds until you undo it or a default timer removes it. I have to set it for each feed. The only workaround is to set it for a folder but if you then go to a feed you lose the range again.
- Marking all as read should only mark those within the range as read or at least it should give you a dialog with this choice.