Hi Michael,
I would suggest that you check out the mailing list archive, questions
like this have been answered several times.
The idea of the SmallWiki 1 Security system is that you define the
default role is defined in the root node and then every structure
(including the root) is able to redefine the roles.
Lukas
--
Lukas Renggli
http://www.lukas-renggli.ch