IANTOP, but think a change could be written in to make the comment post as screened (probably by click through on to the "more options" page for those who use quick reply) initially, which would get around people tracking by email still getting the message in their inbox.

Personally, much as I loath people thinking that posting a comment then deleting (or in this case, screening) is anything other than public posting (subject to locked posts, filters, etc.), I actually like the idea of being able to screen my own comments (not that I can think of any I'd screen, off-hand). PMing isn't the same (for those that're gonna say it) 'cause then you lose the threading.