This is not going to do very much. A manager does not need to be "not banned" to do their job as a manager, and they could potentially do their job in its entirety off the forum without even disclosing their account.

I have long advocated for reports regarding damage done via individual company's signature campaigns in the form of number of bans issued, and posts deleted (and associated reasons).  

theymos had previously broached the idea of people subscribing to a signature, but perhaps the "author" of a subscription could (optionally) need to authorize subscriptions so to prevent spammers subscribing to signatures with the intent of making a company/manager look bad