Is it possible to rename the towns and capitals in the game, during a game? I tried clicking on the name, but I haven't had any luck.

F.ex, maybe I want to change Georgetown to Georgetown (M). I want to label my school towns for what kind of research I want them to do. In M2TW I renamed my main production towns for what kind of unit I wanted to build there (infantry, archers, etc.) and it made things easier to keep straight when my empire grew to humongous proportions.