Rice hulls are a very good idea. Make sure your sparge water is right at 168.
I baked the pumpkin a bit in an oven (cookie-sheet with tinfoil, 350 for an hour) before I mashed it. I I think that helped, as it made it drier, and easier to stir in, not as slimy.
The pumpkin really affects your strike temp. My pumpkin was cold, and brought down the temp a lot, beersmith didn't have a good way to account for that, and I had to add hot water to bring it up.
I didn't have any stuck sparges once I got it started, but my efficiencies were terrible. Hopefully yours goes well.
If you do get one, don't sweat it, try to flow some wort back into the tun by lifting the siphon tube up and down. If all else fails, stir it all back up and re-vorlof.
Good luck.