I must first say that you used the Door-in-face technique quite well in the thread title, well done. Compared to duhttp://www.wsu.edu/~brians/errors/dual.htmll wielding bows, shooting multiple arrows seems more than acceptable. Giving archers some kind of multishot ability/perk would be very cool. While it isn't realistic (or even possible?) it has been a staple of many fantasy games and it would add some depth that is sorely missing from the marksman skill.
I thought the "shoot two arrows at once" idea was pretty dumb, then I found http://www.youtube.com/watch?v=uE7A_4M7OqQ. It doesn't look half bad.
Thanks for the link it's satisfying knowing that it's possible