I thought this might be an essential feature to add to account security before the game enters alpha 1 (whenever that might be). Some of us have accounts worth an awful lot of money and protecting those accounts should be a high priority.
If you added a feature that when you log in to your account, you also need to enter a six-digit number that you receive via SMS text message to your mobile phone, it would help protect peoples accounts from being hacked.
Having a strong password is obviously important but having two-factor authentication would add another layer of protection to high-value accounts.
Imagine if a King lost their account due to a hack.