I do not know the feasibility of my suggestion, but at face value it seems simple enough. Please add a checkbox in settings that will disable map chat specifically within the major cities. I very much profit from map chat in the open world, but within Lion's Arch and Divinity's Reach the map chat is 80% undesirable (and I am being conservative). Certainly it is possible to turn it on and off manually, but if the program could do this automatically, I think it would really improve the overall gameplay experience.