I am revisiting this issue, and am not having any luck. Any help would be GREATLY appreciated. This is what I have done so far:
1) Added a new role "Super Admin" using the site admin interface
2) Enabled sucurityTrimming in the root web.config:
<siteMap enabled="true" defaultProvider="AdminXmlSiteMapProvider">
<providers>
<clear/>
<add name="AdminXmlSiteMapProvider" type="System.Web.XmlSiteMapProvider" siteMapFile="~/admin/admin.sitemap" securityTrimmingEnabled="true"/>
....
</providers>
</siteMap>
3) Added "roles" attribute to each node in the admin.sitemap file:
<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" enableLocalization="true">
<siteMapNode url="~/admin/default.aspx" roles="*" title="$Resources:adminNav, Default">
<siteMapNode url="~/admin/overview.aspx?view=si" roles="Administrator, Super Admin" title="$Resources:adminNav, Site" >
<siteMapNode url="~/admin/sitesettings.aspx" roles="Super Admin" title="$Resources:adminNav, SiteSettings" />
<siteMapNode url="~/admin/rewriteurls.aspx" roles="Administrator, Super Admin" title="$Resources:adminNav, RewriteUrl" />
<siteMapNode url="~/admin/contentedit.aspx" roles="Administrator, Super Admin" title="$Resources:adminNav, ContentManagement" />
<siteMapNode url="~/admin/overview.aspx?view=sec" roles="Administrator, Super Admin" title="$Resources:adminNav, Security">
<siteMapNode url="~/admin/userlist.aspx" roles="Administrator, Super Admin" title="$Resources:adminNav, UserAdministration"/>
<siteMapNode url="~/admin/rolelist.aspx" roles="Super Admin" title="$Resources:adminNav, RoleAdministration"/>
</siteMapNode>
....
4) Added the role to the admin/web.config:
<?xml version="1.0" encoding="utf-8"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
<system.web>
<pages theme="dashCommerce" />
<authorization>
<allow roles="Administrator, Super Admin" />
<deny users="*" />
</authorization>
</system.web>
</configuration>