"Hmmm, I don't seem to have any tickets that mention this :)"
I apologize, this was my mistake :).
In reference to your question:
Unfortunately, the requested client-side functionality does not exist and for the time being you can change the service only on the server. to do that, I recommend you to wrap the control and the buttons in an RadAjaxPanel (or use a RadAjaxManager in order to implement your scenario) and then change the RadRotator's WebService settings in the Button's Click server-side event. In this case you can assign a Session value and then use that value in the WebService method.
I hope this helps.
All the best,
the Telerik team
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