All controls that are missing under <toolboxControls> section can be added manually there. There are several controls that are embedded in the assemblies and automatically listed in the toolbox section. Their's names cannot be changed. You can add the same controls to the toolbox section, using a different names.
Example that demonstrates registering NewsView control with different name.
|<add name="CustomNews" section="CustomNews" type="Telerik.News.WebControls.NewsView, Telerik.News" description="" />
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