This is another quality of life suggestion -- how about a confirmation button or screen before grabbing a country a second time if you're in GDI on the Express server. Sure, it could be argued that it's the player's fault for being ignorant, but on more than one occasion I've read about somebody getting AB'd because they accidentally clicked the attack button twice, or thought they lagged out and attacked again. I think it goes in the same category as confirming CS destruction, where a brief lapse in judgement (or connection) could ruin an entire round for that player.