It looks to me like the discussions are currently ordered according to their original posting date. Since this is "an LW forum", a forum-type solution that showed on top the discussions with the most recent comments might be better.
Most recent event [original posting, comment]?
[Edit to remove "post edit" and "vote" events after Kaj's comment.]
After contributions from a number of us (by random example here, here) over a number of months, particularly User:wmoore and User:tommccabe (and all happening before User:Yvain's work here, so we missed those ideas) we have a discussion area.
Discussion, including discussion of the discussion area, is welcome.