By default there is only one superuser for MoinMoin wiki.

If want to add multiple superuser inside the wikiconfig.py can try the following :

    # This is checked by some rather critical and potentially harmful actions,
    # like despam or PackageInstaller action:
    superuser = [u"namran", u"azri", u"irfan"]

    # IMPORTANT: grant yourself admin rights! replace YourName with
    # your user name. See HelpOnAccessControlLists for more help.
    # All acl_rights_xxx options must use unicode [Unicode]
    acl_rights_before = u"namran:read,write,delete,revert,admin azri:read,write,delete,revert,admin irfan:read,write,revert,admin"
    # the rest of Family member can read all the post that is not ACL enabled. keep out the rest.
    acl_rights_default = u"FamilyGroup:read,write,delete,revert All:none"

whether or not to enhance the security portion with HTTP auth , LDAP auth or anything single-signon thing.
Is not covered here. 🙂