Cell borders are not set when the border is set on the table:

 <table border="1">

Currently RadFixedDocumentInfo is used only for export of Author, Title and Description document metadata properties. This should be extended to support custom properties. We should also implement the import of RadFixedDocumentInfo.

PDF/A-1a is with conformance level A (for "accessibility"), and must adhere to all of the requirements of the PDF Reference as modified by the ISO 19005 specification. 

It requires structural and semantic properties to be preserved. Level 1a uses “Tagged PDF” and Unicode character maps to preserve the document's logical structure and content text stream in natural reading order. 

The following features are used:
- Language specification
- Hierarchical document structure
- Tagged text spans and descriptive text for images and symbols
- Character mappings to Unicode

The purpose is to improve accessibility and make the content accessible for screen readers.

The currently supported compliance levels can be found in the How to Comply with PDF/A Standard article.

Currently, for .NET Framework scenarios, this could be achieved using RadPdfViewer's WPF control ThumbnailFactory class. Sample code may be seen at this forum post:
http://www.telerik.com/forums/pdf-thumbnail-returns-transparent-images#jO33X-E8Cki_qLh_KsToWg.
The feature should be implemented for .NET Standard as well.

Provide API or mechanism for reusing the already embedded fonts instead of creating a new one when editing an existing document. 

This causes an issue in adobe preflight (font name is not unique).  

The issue is observed when performing merge with RadFixedDocument as well.

Hidden fields with pushButton widget become visible when using FlattenFormFields method to flatten fields.

Workaround: do not flatten fields if the IsHidden property of any of its Widget's is set to True:

 var fieldsList = formFields.ToList();
 for (int i = 0; i < fieldsList.Count; i++)
 {
     var field = fieldsList[i];
     bool flattenCurrentField = true;
     if (field.FieldType == FormFieldType.PushButton)
     {
         PushButtonField pushButtonField = (PushButtonField)field;
         PushButtonWidget[] widgets = pushButtonField.Widgets.ToArray();

         foreach (var widget in widgets)
         {
             var baseType = typeof(PushButtonWidget).BaseType.BaseType.BaseType;
             PropertyInfo[] properties = baseType.GetProperties(BindingFlags.NonPublic | BindingFlags.Instance);
             PropertyInfo isHidden = properties.FirstOrDefault(p => p.Name == "IsHidden");
             bool value = (bool)isHidden.GetValue(widget);
             if (value == true)
             {
                 flattenCurrentField = false;
                 break;
             }
         }
     }

     if (flattenCurrentField)
     {
         document.AcroForm.FlattenFormField(field);
     }
 }

Allow table spiting to be done on whole rows instead of splitting the content of the rows.

Attached is a small project that shows a possible workaround.

The table border styles are not imported correctly with a specific document.

Workaropund:

RtfFormatProvider provider = new RtfFormatProvider();
RadFlowDocument document = provider.Import(File.ReadAllText(@"..\..\test.rtf"));
 
PdfFormatProvider pdfProvider = new PdfFormatProvider();
var tables = document.EnumerateChildrenOfType<Table>();

foreach (var table in tables)
{
    table.Borders = new TableBorders(new Border(BorderStyle.None));
}


using (FileStream stream = File.OpenWrite(@"..\..\result.pdf"))
{
    pdfProvider.Export(document, stream);
}

Images could have orientation set in their metadata:

Workaround: Rotate the image before inserting it into the RadFixedPage (check the attached project).