Current questions and answers regarding the map editor.

1) If you change any building on one map, then the same changes will occur on all other maps, as the map becomes a mod (this will always happen).
2) You cannot isolate the map. If you need a building with a texture from some tavern, but with different functionality, then the easiest way is to create a new object and use the visual you need, and use scripts to make it work. This way, there will be no impact on other maps.