I haven't modified the code to enforce the 3 day time limit, but I've already sent Mac an email to remind him.
One other thing that I've been wanting to do, for years actually, was to make a "simultaneous-play" which would allow players to make 1, 2, or maybe even more turns each day. I know that would change the dynamic of the game, possibly mixing up strategies, but the main idea that I like about it is allowing people to jump on and have something that they can do each time they come. I still haven't figured out how I'd want it all to work though, but I know it will require code changes to practically every page, so it's not going to happen tonight.
<<Edit: Grammatical/spelling error>>