Well then. You can move forward and propose to ban all sig campaigns with spammy participants, the ones that encourage creating new accs and starting spam threads, or simply track the campaigns that accept shitposters. I believe that that will be the same campaighs that accept neg trusted members.
Imho the will to make this forum better is always good  but extra moderation is always a double edged sword that might make the forum less friendly. For now trust in general works like.... trust in real life, where if you know that the person is not trusted you are dealing with him at your own risk because he may brake his obligations. The same things is applied here (at least DT members are advertising the campaign in the negative way).
Imho the forum rules shouldn't be changed. At least untill we face some serious threat from DT members that I believe will never happen.