I’d second just about all of that. With emphasis on distinguishing (read: filtering away) clash stuff: I might want to read about it when notified, but, really, dragging me into it wastes my time first, but then yours too if I get to the point of interacting.
By that you mean total score? (upvotes minus downvotes)
I see no reason why this should be restricted to moderators. I mean, you didn’t intend on something massive space-wise, did you? Moreover, I’d appreciate it if you could keep the information of who already approved or refused a contribution available somewhere.