In a bowl, cream shortening and sugars. Add eggs and vanilla. Combine flour, salt and baking soda; add to the creamed mixture and mix well. Fold in 1-1/2 cups "extras". Shape into a 15x2-in. roll; wrap tightly with plastic wrap. Chill 2 hours or up to 1 week.
To bake, cut into 1/2-in. slices. Place 3 in. apart on ungreased baking sheets. Bake at 350° for 10 minutes. Cool 5 minutes; remove to wire racks.