System.Web Namespace

Hi David,
How do you go about deciding the depth of the namespaces which you allow in the Scripting components?

I am looking to prototype something in the System.Web.Script namespace, but I only get access to .ASPNetHostingPermission, .AspNetHostingPermissionAttribute, and .AspNetHostingPermissionLevel... I get no access to the .Script and the Serializers.

I´ve no need to go to a custom component just yet, so I was wondering where are the limits of whats available from the scripting components...

Thanks!
Luis