Actually Jerry, it's the other way around. I want to replace Webmin, not add to it.
I think that Webmin's interface is painful and it is too easy for an inexperienced user to shoot themselves in the foot.
There is not the fine grained delegation either (eg. let a user modify a DNS record or zone but not delete it; keep a revision history of email aliases and accounts).
Thus the idea that AOLserver + a database is the best place to store configuration data. OpenACS already has the authentication mechanisms and the ability to restrict or grant certain privs on an object.