I love this idea, and welcome any attempts to improve the quality of comments on HN (despite already being one of the more sensible discussion sites).
My problem is with the not being able to post more comments while one is pending. I'm mostly a reader/lurker and only really comment on posts which really get me fired up. Now what happens when I'm taking 30 minutes in the morning to read HN and want to make 2/3 comments on a couple of different posts? Would I now only be able to comment on one and hope the others remained suitably visible for me to find them later? I really think blocking further comments while a user has a pending one is a terrible idea, and will only harm HN in the long run.
My problem is with the not being able to post more comments while one is pending. I'm mostly a reader/lurker and only really comment on posts which really get me fired up. Now what happens when I'm taking 30 minutes in the morning to read HN and want to make 2/3 comments on a couple of different posts? Would I now only be able to comment on one and hope the others remained suitably visible for me to find them later? I really think blocking further comments while a user has a pending one is a terrible idea, and will only harm HN in the long run.