Preheat oven to 350°. On a lightly floured surface, roll dough to a 1/8-in.-thick circle; transfer to a 9-in. pie plate. Trim crust to 1/2 in. beyond rim of plate; flute edge. Refrigerate while preparing filling., In a Dutch oven or large saucepan, melt butter over medium heat. Add pecans; cook, stirring constantly, until very fragrant and pecans start to brown, 4-5 minutes. Remove pecans with a slotted spoon, reserving butter in pan. Stir in brown sugar, maple syrup and salt; bring to a boil. Reduce heat; simmer for 2 minutes. Remove from the heat. In a bowl, whisk a small amount of the hot mixture into eggs; return all to the pan, whisking constantly. Stir whiskey, if desired, and vanilla into brown sugar mixture; stir in pecans. Pour into crust. , Bake until a knife inserted in the center comes out clean, 55-60 minutes. Cover edge with foil during the last 30 minutes to prevent overbrowning if necessary. Cool on a wire rack. If desired, top with whipped cream and cinnamon. Refrigerate leftovers.