I would like a function to mark Accounts as 'suspended', which prevents further registrations/invoices.

This functionality would be for the following situations:

* Companies which are no-longer trading

* Companies/individuals which have defaulted on payment who we no-longer wish to work with

Currently, our solution is to add 'do not use' to the account name, account notes stating what the situation is, and hoping that when a manual order is processed, that the team member will see it. 

There's nothing to stop an order being processed by the API, however.