Is it against the rules to double when the cube is dead? I know that Brainking, Vog, IYT and TrueMoneyGames disable the cube when it's dead. So does GnuBg and, I suspect, Snowie. But is that a matter of being sensible or is it a requirement? I've just discovered at GoldToken that at 1-away I'm still be asked whether I want to double or roll the dice.