In addition to what you've covered here, I think there's a substantial and largely unexplored set of techniques necessary for groups to act rationally. #6 on your list, efficiently accessing others' knowledge, is one aspect of this; Eliezer's "Craft and the Community" sequence also establishes a goal and some good examples of what not to do. Aside from that, though, we don't seem to have collected much instrumental knowledge in that domain.