Ah I understand what you are saying now. But that might make things a bit more confusing while it should stay very simple. If you have it set to only show active threads in the past 7 days, you will still see what threads are new within the past day because they are marked as new, so there is no reason to change it to only the past day.
Really, the only reason this is here is to cut down on the mysql load. If someone visits a forum once a week, then they would probably set this to active in the past 7 days. If you visit daily, then the past day or 2 would be fine. There isn't much need to be changing it all of the time.
