Another idea which could work, something like merging the SMAS list into the trust system:
- On every profile, besides Trust, there's an option to mark user as spammer
- This instantly makes that user's signature invisible for the user who marked him, or add him into the ignore list, to be decided
- If the user who marked him is on DT1 or DT2; staff; or any other list to be decided, then the marked user losses the right to wear a signature. This way, it's not up to signature managers to allow them into a campaign or not. The forum would disable the signature for him
Some details should be discussed, but that would be the idea.
An unjust solution.
Being on that list is a ticket to hide any member's signature(mark user as a spammer is a check mark "No one can know you or Grievance against your decision").