They make battery powered impact guns. I have a 18v Ridgid and it works excellent. There is no need for an air gun unless you are a professional mechanic.
Most tools will work on most cars. Every manufacturer is using metric bolts and fasteners nowadays. And either way, tools are an investment. You buy em once, you wont need to buy them again.
And most of the time, owners manuals specify lift points. I just double checked mine, and your right; their not in there. But if you don't know how to properly jack your car, you shouldn't be working on your car anyway unless you want 2500lb of car crushing your chest.