Not all of the above can likely be done only through the Map Editor, but the task is not to "add a city of 8 Factions to the game," but specifically to create, on a particular Map, a single Object that functionally includes the cities of all 8 Factions for convenience. Because all attempts to organize the Pub result in these 8 cities taking up an unacceptably large amount of space, and they cannot be physically arranged "fairly" in relation to each Faction due to their shape.
Added 3 minutes later
And as an addition. Is it possible to create a "Duplicate" of a City? That is, a new object with identical functionality, but occupying, for example, one cell on the map? (So far, all I've managed to do in this regard is create a non-clickable city. That is, when you enter it, you end up on the city screen without an interface, and you can only leave such a city using hotkeys or not at all)