You can use a coil nailer or stapler for composite roofing. This is not the same as a finish or framing nailer. I bought a Porter Cable coil roofing nailer five years ago and used it ONCE! I now live in a house with a cement tile roof. Need one?
Anyway, it was well worth it, and I probably could not have rented for less considering I took about 3-weeks to complete the roofing, about 33 squares of 30 year architectural shingles. The best part is I did not smash my thumb once, and the job went quickly.