When printing a page that has a certain page format (format/page/page/format
listbox) with paper settings in the printer settings dialog set to a page format
that our printer can do, the first setting takes precedence -- I would consider
this a bug, given what the competition word processors do. In M$-Word, I think
that a change of paper format in the printer settings causes the page to be
reformatted (also ugly IMHO, but at least a network printer prints something at
all...)

The Postscript output contains a <</PageSize [width height]]>> setpagedevice 
instruction. Maybe, one could simply choose width/height based on the printer
settings dialog, and the layout width and height from format/page/page/format
listbox, and show a warning dialog when such a document is going to be printed...