Hello Björn Karlsson,
Your notes make perfect sense. Actually we did not consider exposing the property on the client as it was needed in automatic Load On Demand setups only and was introduced with the feature itself.
Still a case as the one you describe is pretty real and the same property could reduce much of the needed work. So we logged this as a feature suggestion and you can track its status here to know when it is ready. I also updated your Telerik points for the suggestion.
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