Pork Roast with a pumpkin spice rub.. how would you kick the up a notch?

If you're looking for very little kick, heat-wise, I'd try Ancho (poblano)chili. I think the earthy tones of the ancho would go well with pumpkin as well as the brown sugar. If you wanted the next step, chipotle (jalapeno) would bring a bigger kick quick. A little chipotle goes a long way. Penzey's is the place I get all of my spices/herbs from. They have stores in many major markets, as well as online.

I made a pork roast simuler to your's last October. I would also add Ancho chili to your rub.

With mine I injected it with Shipyard Brewing's Pumpkin head ale mixed with a bit of apple cider and some of the rub.