Just install vimperator or conkeror.<p>It's called a user agent because the user controls it. Don't rely on site authors to care about your special needs!
cool idea, but no reason to wait for PG to do it. it shouldn't be hard to hack up a greasemonkey script or a chrome plugin to add that functionality for yourself. then once you've proven its usefulness, i'm sure PG would be happy to consider adding the script to the site for everyone.
If you are using Conkeror, you can use create a page mode, specific to a site - <a href="http://conkeror.org/WritingPageModes" rel="nofollow">http://conkeror.org/WritingPageModes</a><p>Conkeror seems to have a reddit mode already in place, may be you can cook up a mode for HN - <a href="http://conkeror.org/PageModes" rel="nofollow">http://conkeror.org/PageModes</a>
See <<a href="http://news.ycombinator.com/item?id=277099>" rel="nofollow">http://news.ycombinator.com/item?id=277099></a>; -- the linked post doesn't seem to work for me, but the first link in the first comment does.
We use and maintain this: <a href="http://www.acunote.com/open-source/javascript-keyboard-shortcuts#greasemonkey" rel="nofollow">http://www.acunote.com/open-source/javascript-keyboard-short...</a><p>It's modeled on Google Experimental, and other Google/vi-style shortcuts. Would love to see something like this implemented in HN codebase.