Not sure, but my guess is that you would need to cut the paper/canvas from the roll. I've found it pretty easy with canvas, but paper is a bit more tricky. If you do cut from a roll take care to cut square otherwise you will have feed problems.
If you only want to print B&W you might like to look at QuadToneRIP. I've used it on my 3800 for B&W panos up to 1.8m long.