1) How about keeping users logged in for a month or so? Hulu keeps me in for a month, Netflix doesnt boot me out until 3 months have gone by, and Gmail, ebay, and facebook all keep users logged in for at least 2 weeks before requiring them to sign back in. So why does CC need to be so secure? its kindof annoying. The default should be 4 weeks with maybe an option for people to adjust it down if they want to.
2) How about an option to set the number of reinforcement movements to 5 or so per turn? Unlimitted reinforcements give the starting player too much of an advantage, and chained reinforcements slow the game down too much (especially 1 on 1's on large maps). It would add a great new dynamic to the game to have that option.
3) How about creating a reset button to re-arrange troop deployment prior to starting your turn? Or maybe creating a way to shuffle armies around the board until you chose to lock your selections in and start your turn. That would make troop deployment alot more user friendly.