- Have a document with a mail merge field (i.e. from Bibliography)
 - Tools | Mail merge Wizard
 - Step 8 "Save, Print or Send"
 - Select radio button "Print meged document"
 - [Now the dialog offers a list box to select a printer, and buttons
"Properties" and "Print Documents"]
 -> The button "Print Documents" does NOT offer the same dialog as "File-Print"
when a document without mail merge field is used. 

-> ONLY via "properties", one MAY get lucky when searching for an option to
print several copies or select a certain paper tray. But this requires the
respective printer system to offer it.

First idea for a solution: Call the same dialog as "File-Print" does when a
document without mail merge field is being used. This would give access to
further options as well.