"He who marches out of step hears another drum." ~ Ken Kesey
On Epsons you can adjust the sensitivity of the "eye". Ours is in a bright area so we had to adjust itdown to see films. I would imagine Canon has something similar.
I switched to a Canon printer after too many headaches with my Epson. Can't help you with the roll problem, but for media type mine has the photo paper option. They're nice printers, but I can't get them to print nearly as dark as an Epson. When I can afford it I'm going with a 4900. If anyone knows how to make a Canon print darker films, let me know.