how to unpublish a comment rather than deleting it I like to use "threaded style" comments. However the problem with them is that when a users deletes their own comments all the "replies" to those comments are deleted as well.

Is there a way to "unpublish" those comments instead of deleting them?
To unpublish a comment, click on the link to edit it. In the page that appears, you will see an "Administration" section that is a a collapsed field set; select the "Non published" checkbox, and the comment will be unpublished.



If you unpublish a comment, the child comments will still be published; you need to unpublish each of them.