The doulbe-hop problem is due to the fact that on Windows networks, impersonated credentials can't be used to access network resources - this prevents a web-server from maliciously or accidently using the credentials of a user who innocently logged on to it to access protected network resources. Therefore, it is not related to the RadControls.
Still your solution seems valid and viable. As for the auto-generated desginer code, you can take advantage of all the classes being partial which means that you can add your custom code in a separated file which will not be touched by the code auto-generation process.
I hope this helps.
the Telerik team
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