Quoting Quanah Gibson-Mount <quanah@zimbra.com>:
That'll work up until the point cn=config is migrated to a binary backend such as back-mdb, and there are no flat text files to access at all.
It'll work after that as well: you'll still be able to create n0 from zero with slapadd in the same way that you can already create n2 from zero with slapadd.