Is it possible to use this Role Provider AspNetWindowsTokenRoleProvider with ASP.NET FORMS Authentication (via this MembershipProvider System.Web.Security
Implement your own ADAuthorizeAttribute by inheriting from AuthorizeAttribute and overriding AuthorizeCore. It's a lot easier than implementing your own role provider or installing and configuring AzMan.
See my example here:
ASP .NET MVC Forms authorization with Active Directory groups.