Billing Console - Allow for easy removal or temporary de-activation of credit card

The billing console doesn't allow you to remove or de-activate a credit card. This should be possible in the scenario where you don't have permission to use that card or where you aren't going to renew but you want to use the remainder of your subscription. Everything else with this system is lovely except the billing which has caused me considerable stress.

Background: My supply chain rules say that I need to have any purchases approved. Un-authorised use of a credit card will create an audit query. I need a mechanism to avoid a card being charged where authorisation hasn't happened yet.