Just adding my two cents but the majority of 40K RP's I've been a part in die very quickly because player A wants to be a Tau Player B - Necron etc and everyone plays their own story line and gets bored with no one to properly interact with. The reason I like this RP is that it has stuck to one faction (Or close enough) in the universe and then further limited the options, personally I would be really happy with everyone being a Space Marine and us each taking a different role in the squad as we fight Chaos (Salamanders wouldn't be my choice but meh I don't mind :P) 

Just my opinion but I would prefer less options than more funnily enough, when it comes to race/role ect.