FWIW, a friend of mine that's been brewing about 20 years told me to add the pumpkin to the mash last after mashing in the grains. Seemed to work well for me. Make sure to grab a pound of rice hulls too.
EAC - 5/2/14
Growing Hops in Key West, FL....
: Northern English Brown
: Mounds Bar Imperial Oatmeal Stout, Sweet and Sour Wit, Imperial Rye Cream Ale
: Steamboat Willy Cali Common, Rye PA
: The HBT Sweaty Fat Guys Cigar club