Don't know how to scale multiple faces.
Take a cube and select two faces opposite each other. Select the move tool and move it left or right. As you can see, both faces move left when you move the move tool handle and and move right when you move the tool handle right. If you select both faces and go to extrude face, then move the manipulator outward from the box, both faces move away from each other. Is there a way to move both faces away from each other without using the extrude face or scale tool? I actually am going to apply this to something more complex.
You see, I have a model of a dinosaur. I selected all the faces, then chose Duplicate Faces. I then scaled down. When you do this, it scales down each face without moving it to a different possition. It is the equivilent of selecting every face once at a time and scaling it down. If you were to select all the faces then scale it down using the scale tool, however, you would just scale down the size of the entire object.