I'm not sure what controls you're using in your project, but building a single assembly containing them might not be a trivial task considering the amount of components we provide and the dependencies they have on each other. What is more, I think this would complicate the upgrade process should you decide to switch the version of the libraries that you're using.
According to our license agreement, before deploying your application you need to ensure the assemblies are protected. This is achieved by rebuilding the controls using the approach described here
and practically depends on a modification to the Telerik.Windows.Controls assembly since all controls depend
on it. That said, extracting the code and rebuilding it in a separate assembly would not be compliant with the redistribution policy.
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