... and more wankiness, which I need to come back too and study up on to see what I can glean for our purposes!
http://serenitybgs.wikidot.com/campaign-background
This is the site of a gamemaster's (Jim Davenport?) Firefly RP. It looks like it was a helluva great campaign! Not all of his 'Verse assumptions are going to match ours, but I'm betting there will be some choice tidbits here...