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You can set the data of an image with the LoadFromUri event, but there is no way to set the size. 

In the XML all merged cells have the same content, instead of only the one visible having content and the rest being empty. This sometimes causes all cells to be visible in editors.

It would be very nice to have some kind of repeating column header, especially when exporting to PDF.

The fix is available in our latest LIB release (v. 2015.1.0316).

They are exported with the /EmbeddedFiles switch. This would allow adding external files to the PDF document.
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This item is migrated to the Telerik Document Processing portal: 
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The standard fonts listed at http://docs.telerik.com/devtools/wpf/controls/radpdfprocessing/concepts/fonts#standard-fonts cannot be embedded in a document. Using one of them prevents the document from complying with PDF/A standard.
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If there is a way to do this, I would love to know. It is driving my users crazy.

According to http://www.digitalpreservation.gov/formats/fdd/fdd000251.shtml#sign there should be two elements in the XMP-metadata to indicate the PDF/A conformance level.

Here is an example:
<rdf:Description rdf:about="" xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/">
  <pdfaid:part>1</pdfaid:part>
  <pdfaid:conformance>B</pdfaid:conformance>
</rdf:Description>

or attribute version:

<rdf:Description rdf:about="" xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/" pdfaid:part="1" pdfaid:conformance="B" />

See also http://www.pdfa.org/wp-content/uploads/2011/08/tn0008_predefined_xmp_properties_in_pdfa-1_2008-03-20.pdf

and http://www.aiim.org/documents/standards/PDF-A/ISO19005AppNotes.pdf

The fix is available in our latest LIB release (v. 2015.1.0316)

Transparency is not shown when we add png images.

The feature will be available in our official release Q1 2016.

Exported <li> element contains inline style property "text-indent" with value -24px which causes the list item's text to be "under" the list item symbol.
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One requires to create QueryableCollectionView on the UI thread.
Now there's going to be a .Count() call on the IQueryable passed into the constructor,
which will block the UI thread until it returns.
There might be various reasons why there is delay (unable to connect to DB,slow query, using a REST queryable provider, etc).

It would be nice if we could pass in the count ourselves.

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I am currently working with MaskedInput control, and I have an issue on your documentation.  Why is there no explanation on all the properties, even in your demo there are a lack of explanation.  For instance, SpinMode, what is this, what does it do?
IsManinulationEnabled, what does this do, under which control, the Numeric,, Decimal, DateTime or Text???  Why Text and Value.   What is OriginalValue means? The control have an AcceptsReturn properties, why not an AcceptsTab properties?