Adding routing to a ASP.NET Dynamic Data site to accommodate User and Admin Views.
As for securing the application using the web.config/ASP.NET User Group approach will only secure at the route level. Meaning only views that are seen through that route can be seen by an associated User Group. To get more granularity (down to the field level) in your application some extension methods will need to be added which has been devised by Stephen Naughton - http://forums.asp.net/post/2730998.aspx
Hope this helps.