I am creating some Graffiti sites for clients.  I am using the dynamic variables feature of themes for site wide configuration.

I want my clients to have the ability to edit the configuration without being able to have other admin privileges.  In other words for the "gManager" role, I would like for them to be able to access:

/graffiti-admin/presentation/themes/ConfigureTheme.aspx

However, when I log in as a gManager and type the URL manually, I am redirected to the home page. 

I've tried forms authorization in the web.config, but no luck.

How can I overload the current role permissions for gManager to allow them the access of changing those variables?

Thanks,
Joshua