Admin Controlled Ignore

[dapoling]

1. I am looking for a hack to allow the admin to place members on an ignore list of another member?

2. I am also looking for a hack so when people are placed on ignore list the post is not seen by the other.

This is brought about I have a couple of members that cannot but help dig at each other and apart they both are good members.
I have told them both to place each other on their ignore list and not to respond to each other but it appears this may not be working.
So now the only other option left is to place them into moderation which I would prefer not to.

Thanks.