RTF is a global modification that replaces all towns in the game.

P.S. And what is a "special dwelling on the map"?

I meant a building and object on the map where Yetis can be recruited – from the neutral faction, as far as I know, only Elementals have a dwelling by default. However, I'm not sure if it's possible to create such a dwelling not within a specific map, but as a mod – probably only as a replacement for an existing object, although I might not know all the available options.