Support for forms. The feature is named 'Interactive forms' in the PDF specification.
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The font size in the table does not respect the CSS for the corresponding class. There is similar issue with <li /> element. 
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As one can use annotations you should support attachments per page or per pdf-file.
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http://feedback.telerik.com/Project/184/Feedback/Details/190006 
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http://feedback.telerik.com/Project/184/Feedback/Details/190021 
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http://feedback.telerik.com/Project/184/Feedback/Details/190082 
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When the last element from a table cell is an empty line, the latter is skipped and not imported.
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The document default style properties are not cloned on document.Clone().
There is a workaround by using the following code:

var cloning = this.document.Clone();
ClearPropertiesWithoutValueAndSetLocalValues(this.document.DefaultStyle.CharacterProperties, cloning.DefaultStyle.CharacterProperties);
ClearPropertiesWithoutValueAndSetLocalValues(this.document.DefaultStyle.ParagraphProperties, cloning.DefaultStyle.ParagraphProperties);

private void ClearPropertiesWithoutValueAndSetLocalValues(DocumentElementPropertiesBase propertiesFrom, DocumentElementPropertiesBase propertiesTo)

{
	foreach (var stylePropertyFrom in propertiesFrom.StyleProperties)
	{
		var stylePropertyTo = propertiesTo.GetStyleProperty(stylePropertyFrom.PropertyDefinition);
		stylePropertyTo.ClearValue();
		if (stylePropertyFrom.HasLocalValue)
		{
			object value = stylePropertyTo.GetLocalValueAsObject();
			stylePropertyTo.SetValueAsObject(value);
		}
	}
}
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When using ZipArchive in Update mode do not load entire Zip archive in the memory.
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Workaround:
Copy the default styles after the Mail Merge

RadFlowDocument merged = sourceDocument.MailMerge(mailMergeSource);
merged.DefaultStyle.ParagraphProperties.CopyPropertiesFrom(sourceDocument.DefaultStyle.ParagraphProperties);
merged.DefaultStyle.CharacterProperties.CopyPropertiesFrom(sourceDocument.DefaultStyle.CharacterProperties);
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In MS Word you can crop the image from Picture Tools -> Format -> Size -> Crop button in the ribbon. This preserves the whole image in the file, but when it is rendered it shows only the cropped image area.
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http://feedback.telerik.com/Project/184/Feedback/Details/190008 
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http://feedback.telerik.com/Project/184/Feedback/Details/190038 
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