I like the idea of the stats to - I quite often under use builders and pigs etc.
Adding players: Rather than having the current system where you click, click and click again until you get the right option - just have two options to either add a human player or a computer player. This might allow you to add some simple graphics to the set up screen. It would be nice if it could remember your name (and the rest of your settings!!) after you set in once in the GUI.
Please say if you want any ideas for improving the AI. I have lot's of thoughts but you might already of done much of it.