Use a palm nailer. Paslode, senco, bostitch, ridgid, hitachi and a lot of other manufacturers make them for around $70. They're used with an air compressor and work as slick as a whistle (and a heck of a lot better than anything battery powered that Craftsman makes).
You can also drive structurally rated screws in tight places, especially if you have a right angle drill. Just make sure the screws are rated for the application, and are correctly installed (i.e. you drill the correctly sized pilot hole).
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