Some of our reseller customers don't want their own nameservers but also don't want to use our standard "shared" nameservers. They want ones which are more white labelled.
There is no way to do this that we've found (without losing other functionality)
Even trying to create a reseller which has all permissions and setting them there, which the reseller underneath that works but then account limits apply as set on the top reseller.
It would be nice if the top admin can create a top reseller user and then be able to set limits on levels underneath that (or give permission for them to do that, which would extend one level usually).