Feature Request: Adding a domain to the White list automatically when creating an organization

We have used Zendesk for two years now and we have set up Zendesk Support as a closed portal. We would now would like to have a restricted portal; let the eployees in the organizations that is our customers to self registrer, not at random private person or an employee in a competitiv company, but let our customers add themselves. I have learned that if we whitelist the organizations domain the user having a email to that domain can self registrer, and we really like that idea. So we are a bit disappointet that it's not a better solution than to manually add a new customers domain to the whitelist if we get a new customer organization. This manually work will fail. The request is this: when we registrer a new organization and adds domain, then the domain is added automatically to the whitelist. Thank you!