1 ... I would equip all cars with a robust rubber surface: If I hit something, my car bounces back into shape. Scratches impossible. Great for snow sliding, too: From the roof, via the front screen, down the hood.
2 ... I would be allowed to test new colleagues for their sense of humor before they're employed. If they don't know how to exaggerate, they're out. If they can't roll their eyes, throw up their hands, throw something against the wall, and laugh at themselves a minute later, they're out.
3 ... steak would grow on trees, hot, sizzling, and spicy. No more need to slaughter animals, no more scope to fry the bloody things too long. No more cleaning of greasy pans. I'd pull up a few rosemary boughs growing nearby, to give a special touch every now and then.
4 ... dirt would vanish at a murmur, low and throaty. Something like "Be Gone", without having to open the eyes. Preferably without moving from bed. If I wriggle a toe at the same time, the floor will be clean. If I lift an eyebrow, the windows will shine. If I shake my head, the drain will be free from hair.
5 ... insurance companies and tax consultants would start to speak a language I can understand. On top of that, they's be compulsively honest. Every form I fill in will be rewarded with 500$ for the time and energy I had to invest.