I'd especially enjoy seeing "15 minutes between comments, sitewide" without regard to where they're posted. If you only got 96 comments a day, and they had to b

I'd especially enjoy seeing "15 minutes between comments, sitewide" without regard to where they're posted. If you only got 96 comments a day, and they had to be "at least one attention span" apart, what changes would occur to the tone of discussion at HN and would the quality of discussion end up higher or lower as a result?