This is not in mailmerge, but there was not a correct discussion group. This
was closest.

In Word 2003 option Tools; Letters and Mailings; Envelopes and Labels, there
is no box for number of copies. I frequently have to print more than one
envelope with the same delivery address and have to copy the address to the
clipboard, print, and open the envelope window again, paste the address,
print, repeat. Can you please add a box for number of copies?