Let Engineering Make stuff besides stupid tools that you can buy at vendor. Like for example
Jackhammers/Harvesters/Tillers/Tree shakers/speed diggers/motorcycles/bicycles/roller blades/skateboards. Maybe a giant cannon that install at your house and shoots you to a zone.
Decorations for the houses and furniture. Maybe a robot with storage spots that works your feeders/collectors and works your crops while your gone. How about a hydroponics system for our crops!
Maybe some Guns for killing jujus. Feel free to use these ideas or contact me for more or a indepth way of using them. would love to help.