Should Domain Mapping Plugin use cname index?

Hello,

The domain mapping plugin from wordpress.org (http://wordpress.org/extend/plugins/wordpress-mu-domain-mapping/) could use a cname or ip for the multisite.

I hope wpmu domain mapping plugin also could use cnames for the mapping. So I can change the servers' ip easy.

How do you think about it? Please leave your voice. Thanks.

Regards,
James H.