I went ahead an booted into Windows. Man was this installation OLD or what? I found out that it still holds a previous installation of an HP DeskJet 920 printer, as such I went ahead and checked a few things from the print dialog box (standard Windows dialog for printing) and toyed around for the printer configuration. It turns out that despite the size of the drawing in Inkscape, I could set the size of the paper to print to. The default (since I'm on a Spanish install of Windows) is set to A4 (when will they learn that 95% of spanish speakers live in America and not Europe? *sigh*) anyway, I was able to change the paper size to "papel continuo 
8.5x11 pulgadas" which roughly translates to "continous feed 8.5x11 in", plus there is a small check box to allow printing banners... I attach a screenshot with some comments on it (basically since it is in spanish)... I'm not sure if your particular model of HP printer supports any of these, but I thought it would be worth a try... In the attached image you will see that at least for my currently installed printer it is possible to set it so it can print banners. I'm not sure if this will still require the application to state the number of "pages" the banner will span, or if the printer is able to "make it out" on its own.
<br><br>Good luck!<br>