Allow tracking of "suspicious activity" of a registered customer

As part of the new 3-D Secure standard that is coming into force in Europe, there are a number of new parameters that must be sent to credit card acquirers.

One of these parameters is a new field for tracking suspicious activity with users. To ensure full compliance this field should be added to the customer fields in OpenCart.

On the customer page there should be a new field (perhaps a checkbox?) stating "This user has suspicious activities" that can be set manually by the merchant as they see fit.

This field could be placed at the "Customer Details" page.