I liked MoinMoin as it's a wiki software based on Python. Some thing for the future.
However, I was a Dokuwiki user and I used to create ACL rules through the web interface. It more simple and easier than editing configuration files. All users in Admin group can modify it from the WebUI too.
I hope MoinMoin will use something similar (probably better). This will make it easier to use for more people.
More information about Dokuwiki ACL is here: http://www.dokuwiki.org/acl