Digital BW, The Print

Some time ago I bought aan Epson 4800 and I'm now trying to figure what is the easiest way to deal with roll paper. I'm sure it's pretty straightforward but one way or another I can't get my head around it.

Currently I have 4 panaromas. Each is to be printed on the same height (17" roll) but with different lengths. I've the option to print via Photoshop, Lightroom, Qimage or directly via QTR.

Off course I can set the paper size manually in the epson driver or in QTR for each image. But isn't there a way in which I only set the heigth and let the software automatically adapt the length?  

Joost