This type of feature is exactly the reason I don't participate in StackOverflow. Granted, pending-comment is better than can't-comment.
That said, I expect this will save me hours of my life since I expect that I won't bother to write comments once this is in effect (and as an added bonus, there should be less comments to read). I tried noprocrast and couldn't handle it, but this will do it.
SO has a lot of garbage posts which people expect two lines of description will receive a programmatic solution. Sometimes some moderators and users with high reputations do over-edit posts. But HN is not excluded.
That said, I expect this will save me hours of my life since I expect that I won't bother to write comments once this is in effect (and as an added bonus, there should be less comments to read). I tried noprocrast and couldn't handle it, but this will do it.