||A script might be able to help here but it's not ideal, doesn't guarantee results and is clumsy.
You would first have to select and copy the text to the clipboard and then invoke the script.
The script would take whatever is in the clipboard and print it as if were a portion of the
message (the script could add selected header information to the message to be printed).
Subsequent to this I wrote the "PrintSelectedText" script and posted it to the
registered users area.