Charles, 1. you can scale an object numerically using the controls at the upper right of the screen. Just select the middle tab (marked with "measuring sticks"), then the upright box of the side icons (marked "size"). 2. you can set the material scale using the controls at the upper right of the screen. Immediately below the image of the material, there is a setting marked "Scale." This setting can also be reached through the Material Summary panel. 3. multi-undo/redo sounds great. :)