So the amount of hackings and compromised accounts have been growing a lot lately. So what I was thinking is implementing a secondary level of protection for the their self.

Back when I was into runescape (a long time ago) they had a feature for this. Your bank account in-game had it own PIN number. So even if someone managed to hack into your account they still couldn't access your items without that PIN number. It would be nice if you could activate a PIN on your account that would be required for all item and TC transfers on your account. This would be a selectable feature in your account settings of course, so no one would be forced to use it.

Its a simple idea thats very effective. I don't see any reasons not to have it.