Thanks indeed for the detailed research!
While I'm not sure of an exact date we would implement the IDE language detection to apply the documentation accordingly, I'll log your request to our bug tracking.
Please, find your Telerik account updated.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed