Ok – if I’m reading the above right, we’re looking to sort the main forum listing (and each forum’s list of topics) chronologically (by whichever has had the last topic/reply posted). Will work on that today.
As for sorting all of the replies chronologically, that will seriously mess with nested replies (I think that will completely break that functionality). Seems like we would have to choose one or the other, and personally, I think being able to reply directly to another reply (and see it visually) has value. What I think we should try first is enabling that other column (the one I posted the screenshot of above), which provides a link directly to the last reply. We can try that out as a group for a while and see if it fills the need.