I don't think that limiting downvotes to accounts with X karma is a significant contributor to the problem of getting attention to a new high-quality post on a fairly high-volume site.
- mandatory 60 second re-click to submit a comment, without edits
- mandatory 60 second re-click on votes after a rate threshold is exceeded
- multiple choice votes to express motivation, intention, feedback
- do not publish karma numbers
- publish "example threads" that show values being practiced, including dead links/comments examples
- randomly assign usernames every 12 months
- tags and tag feeds
