Honestly, you don't need to shake the hell out of a keg to get it to carb. Sure, if you need it in 2 hours it's required. You can just leave it at 10psi and it will carb fine in about 5 days if you've got the beer cold. You can even bump the pressure up to 20psi for a day, then turn it down. Should be carbed in 2 days. It won't taste so great for the first few days though so don't rush it.