Use the following trick to allow your Commander to build more things than normal. You can program a Commander or Construction Vehicle to do the job of another Construction Vehicle or Advanced Vehicle with one easy step. Click on the vehicle that you want to take the abilities from, then press [Enter]. The bar will appear at the bottom of your screen. Then, click on the vehicle which you want the abilities on, then press [Enter] again to disable the bar. Your vehicle has now been programmed. The abilities may disappear when clicking on another vehicle, but you can program it again.