Thanks for the suggestions everyone. In my homebrew world, the world is shattered into sky islands called shards. The only way to get from shard to shard is via air ships called windriggers. My thought was that spiderfolk would make excellent windsailors with their natural climbing ability, and an extra set of hands would help them in working the rigging. I would love to use an official race, but right now I have limited resources as far as sourcebooks, and limited funds for buying them. So unless it's in one of the books I already have, or can be found on the internet, I have to homebrew it.