Something that would be a welcome addition is moving around the expansion map by just pushing the cursor to the edge. I just laid a stonecutter's hut somewhere completely pointless because I had to click on the ground to move the screen. Though movement would need to be quite slow. In too many games, the map moves far too rapidly when the cursor hits the edge of the screen.
I have just realised that I could have scrolled out rather than moved the screen. The things we do when we're half asleep...
And this brings up another point. It would be nice if I could destroy a building that I have placed and get the materials back or at least a portion of them.