>>pg+(OP)
Allow commenters themselves to publicly flag their own comments to prevent them from accruing karma. Call it the "sincerity" flag. Actually, this is my #1 top feature request for HN, period.
>>akkart+t5
The parent to your comment, my original comment, is currently scored at 1. I would like to push a button to make 1 the ceiling score for that comment. I would actually like a button to make 1 the ceiling score for all my comments, too.
>>akkart+G7
One reason comment threads get tendentious is when people think other people are commenting to game the thread and collect karma. The karma-ceiling flag tries to say "this is a good faith comment".
>>akkart+98
I would use this feature for any instance where I try to explain to a new user what kind of tone our community strives for. It would be a way to assure them that I'm explaining this to them for the good of the community, not to garner more karma.