It would be great if you were able to rename castles, it would be great for role play or for fixing mistakes in grammar or repeated names. 

another thing that would be great is for the map to ignore castles when drawing, not its intended use but this weird thing where it blocks you from drawing.

another thing that would be nice is to be able cancel the action of building a castle in case you placed it in the wrong place and would like to move it somewhere else.