Originally Posted by angussf
I don't see that this is configurable using ISPconfig ...
That is right and it is intended, because it's not ISPConfig's job. ISPConfig is responsible for managing web/ftp/mail accounts, but it has nothing to do with configuring addons to services.
Best kept secret is, that God was disappointed with his creation and chose to create the sysadmin the sixth day. That's why he could afford to have a day off on sunday...