Robert McGill, the generator that you created, is it capable of connecting to a WCF service hosted in a Windows application or Windows Service and generate a JavaScript proxy for it? If so, I would be very interested in it for a small project that I'm working on.

Well I ended up building my own javascript/json proxy generator. I can generate a full Javascript proxy for WCF Web Services. It will build up prototypes, requests, responses for all datacontracts and operations.The proxy peforms basic validation for .Net types, and set defaults in the prototypes for .net types.(ex: nullable ints are defaulted to null, and ints are default to 0). It also automatically handles epoch date conversions on send/receive for known types. Since prototypes are generated for datacontracts I also get intellisense for all datamembers when typing in Javascript.

Underneath the hood is uses jquery for the XMLHttpRequest, and JSONP for older browsers that can't stringify. All requests are posts so that the data is encrypted when using HTTPS.

I've got several line of business SPA applications nearly ready to go live using this approach. It ties into KendoUi relatively well. 

It has been extremely useful since now we can maintain one WCF service that supports both JSON and SOAP. So a client(Banks/Insurance Companies) may use our interface or consume the SOAP service direcly. We use a message inspector to handle the security. In the case of SOAP content it will verify the SOAP headers, and in the case of JSON content it verifies the HTTP headers. 

Even if Telerik built a code generator I would be unlikely to adopt it at this point, however I just wanted to share my solution since my original post in March. Hopefully you can appreciate the value in this feature and possibly add it for your other subscribers.