That's nonsense, Nyttend. Requiring an appositive on a U.S. neighborhood is no more a convention than "Apple, Fruit". The name of the neighborhood is, simply, the name of the neighborhood. While individual WikiProject may have developed their own conventions, in the absence of anything, Wikipedia's standard rules for disambiguation apply. Absence of a convention is not an excuse to invent one's own rules. Of course, if there is a dispute, your're right that the matter should be brought to RM.