Thanks, John. A careful read of your new feature post indicates that anyone who wants to, and keeps a copy of the old Certificate, can still reinstall the old key and Certificate.
To me this is acceptable.
For everyone:
If you do that, be sure to save the new key; you'll have to install it again.
Note also that if you don't reinstall the old key and Certificate before you order your new Certificate, you'll probably break your Certificate Vendor's automatic extra-month(s) issue on renewal or competitive Certificate orders.
We do it this way:
We save the old key and cert.
We create the new CSR and key.
We save both.
We restore the old key and cert.
We issue the new Certificate.
When we install the new Certificate we also install the new key again at the same time.
This will keep the extra month(s) issue working.
Is this all too complicated for you? Are you afraid you'll lose the new key and need to get your Certificate reissued? Do you have problems with those pesky CA Root Certificates?
Our special offering for DirectAdmin Certificates including installation may be found
here.
Jeff