There was a feature request that made it to he front page of HN today about adding a footer to the bottom of the comments pages. I agreed with the sentiment and made a greasemonkey script to do the job. You can find it here: http://userscripts.org/scripts/show/33974
The original post about a comments footer is now dead, as it should have been posted to the Feature Request page. You can find the comments to the dead post here: http://news.ycombinator.com/item?id=308047
I think HN needs a better feature request system. Maybe something that could categorize the requests at least.