and things that help the community, i've seen that people give merits to do infographics about the merits system). Yes, they've good designs but there was another way to appreciate the help they were receiven, as i said before, by the Trust System. Are you trying to say that if they aren't merits souces, they can do merits exchanges?
Depends on the quality of their posts. for example: if you read my latest red tagging, you'll understand. if these signature designers are meriting each other back and forth for some low quality posts, you could tag them. don't wait for DT members. you should tag them yourself.