What you say is absolutely correct. Barbarian village color can be individually changed on the minimap if you know that they are there. My intent and purpose is to have a new barbarian village that now appears on the world map be easier to see on the minimap without my having to know that it is there first. The world that I am currently playing on has not had a new barb village appear in over a month. When one does appear I would like to have its visibility more apparent on the map and minimap without my having to make the change individually.