Guys, let's stick with what we have. I can easily still think of ways to cheat, unfortunately, even bypassing "No Cheat":
1) Just edit the XML file in your original install file / add a custom python script there (ie; add a line saying map is visible in a certain year, and then you'll see the whole map).
2) Simply playing out the game (after a DP plays it) to explore the map for spoilers.
Those are some basic ones. Even No Cheat won't stop those - I think it's advisable we trust the citizens and go with No Cheat off, autolog on.