Well, I can see it sort of being used as an implication of trust, but I don't think it needs an Add-On to do so.
Simply host your server, and whatever you do, have some sort of achievments that you would like. When people complete them, you can probably trust that they are somewhat skilled, which would lead to them getting slightly higher 'rank' on the server. In which the host could, say, trust them enough to have building priorities. Such as, If they wish to build in a certain spot, and so does a new player on the server, the one has completed your achievments would get the spot.
That's just an Idea. Not entirely sure how good it is, but, hey atleast I put in some of my 'brainpower'.