In a mixing bowl, combine yeast and water until yeast is dissolved. Stir in milk, eggs, pumpkin, oil, four cups flour, brown sugar, salt, and pumpkin pie spice. Beat for two minutes. Gradually add remaining flour, a little at a time, until a stiff dough forms. Turn dough out onto a lightly floured surface. Knead, adding more flour, if needed. Put dough into an oiled bowl. Turn once to coast entire dough. Cover and let rest until doubled in size, or for about an hour. Turn dough onto a light oiled surface. Divided dough evenly into dinner rolls and place on prepared baking sheet. Cover and let rise again for 45 minutes. Preheat oven to 375. Bake rolls for 20 minutes.