Site Feedback - Catch-up button

blowdart has asked for mark all as read too.  So my explaination of why it's not an easy change is over there too.  We figured more people would read less than half of the threads that exist so we built the data to be scalable that way.  If we hear enough people say they read more than half of the threads that go through the coffeehouse, I'm sure we'd be motivated to make the change.  So far there have been 2 of you.