In large bowl, beat sugar and margarine until creamy. Add eggs, molasses and maple extract; beat well. Add combined flour and baking soda; mix well. Add oats and chopped pecans; mix well. Cover; chill at least 1 hour. Heat oven to 350°F. Lightly grease cookie sheets. Shape dough into 1-inch balls. Place 3 inches apart on cookie sheets. Flatten each ball by pressing a pecan half in the center. Bake 10 to 12 minutes or until deep golden brown. Immediately remove from cookie sheets to wire rack. Cool completely. Store tightly covered.