Moderator reply right under users comment

This is my problem below
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1 – how to allow duplicate comments for certain words and also for certain user-roles

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2 – how create a comment moderator role ..that can decide users/user-roles that should and should NOT be able to comment on a particular role (this moderator role should also be able to delete a comment permanently ..i.e by ‘permanently’ i mean the deleted comment should NOT be moved to bin.)

ALSO this comment moderator-role should be the only role that is able to reply messages from the front-end i.e NO OTHER ROLE APART FROM THE ‘COMMENT-MODERATOR ROLE’ should be able to see the ‘REPLY BUTTON’

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I need everything to be on the front end… I don’t want my users goin to the back end

The page I need help with: [log in to see the link]