[X-Servers] Xserve and DNS - Web admin question

[Kansas Territory]

I don't currently have an xserve and I'm not running OSX server.
But I've been asked to find out some information regarding running an  
Xserve as a DNS server.
specifically..
I've also been asked... if it allows for Customers to have access  
(some web based admin)  where they can edit their own DNS records.
Which to me sounds weird.. for what reason does "joe blow" customer  
need to change a DNS record if I'm already hosting the domain ?


now personally I could understand wanting some kind of web based  
admin for customers to be able to change their email setup.. like  
being able to add new email addresses for their domain and the like,  
or change where their emails are routed to, that kind of thing.    
Does OSX Server offer anything like this ?


Any info would be appreciated.


kansast