Thank you for your feedback.
Regarding the first issue - the RadDiagramShape is a ContentControl, so basically you can insert any image in the shape as its content or with the ContentTemplate. The same goes for adding RadDocuments. Regarding the page size and rules, currently the diagram control has no notion of pages and page sizes. However, this is a great feature request, so I have logged it in our system here
so that you can vote for it and track its progress.
All the best,
the Telerik team
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