Not sure if this is acurate but;
"Unfortunately this option is not available in the US, this is due to
local Patents. You can't even order a CD tray from England and use it on
your unit vital circuitry has been left out, it won't work."
Got this from this review;
http://www.photo-i.co.uk/Reviews/printers/Pixma 5000/page-1.htm
I think that's hype; he was told that by someone at canon.
I really can't see any company making a model and then sending it back to
the factory to disable circuitry.
What I do see is them simply editing out the part of the software drivers
and not including a b-tray with each printer.
And if he is right, how cum it's so hard to buy an extra b-tray? If the
circuitry is really disabled, what does canon care if you buy a b-tray?
Also, why does canon care at all about patents in USA except to make a
desultry effort to abide by it and simply not ship the b-tray nor sell it
in America or S.America?
Look at all the dvdplayers that play region free and are so easy to disable
macrovision etc.
Look at all the software that has decess decoding built in!
I think if we got the overseas drivers and software, plus the tray, knocked
out the little plastic tab it would be good to go.