Wiki user authentication

I've got an Xserve G5 now running Leopard Server in a remote corner of my company, and under the radar... I'm trying to get it to play nice and serve up a few Group Wiki's. After random clicking for a while (and a reboot), I think I've got the wiki in place. Good.

Next step is to be able to give people logins. I don't want to tie into the corporate Active Directory system because I don't want to have to negotiate with corporate IS every time I need someone with the AD password.

Does this force me to create a user for every person that will access the system? Is there a way of allowing self registration?

I'm also not seeing a way for people to change their own passwords...

And, for that matter, is there a way to make the wiki at least viewable without authenticating?

Thanks.