LOCK setting for UPDATE AUTH transactions

[tbone-bts]

I think it would be a good security feature to have a LOCK setting (locked by default) which would need to be explicitly unlocked in order to have the ability to sign any UPDATE AUTH transactions.

While locked, if the user attempts to initiate an UPDATE AUTH action, they would get a message saying that action is locked and must be explicitly unlocked in settings before attempting again.

When unlocked, there should be a double confirmation along with highly visible warning something along the lines of "This is a dangerous action which could result in losing control of your account, etc etc".

After unlocking, it should automatically lock again after some period of time.

[sschiessl-bcp]

You mean like a sudo for critical operations