A small note.

A dialog box with the message "Do you really want to dig?" appears when you click the corresponding "dig" button. But IMO, unwanted digging occurs when, instead of the quick key S (save) (I always save at the beginning of my turn), you press the quick key D (dig). If it's not too difficult, it would be useful to extend the action of this question to the quick key as well.

I also really liked the undocumented feature - the ability to view not only the opponent's turn but also your last turn.