I'm not sure that subjective nonrelativism is a possibility though.
Surely it's a logical possibility. Stipulate: "What's right is either X or Y, where we ask each person in the universe to think of a random integer, sum them, and pull off the last bit, 0 meaning X is right and 1 meaning Y is right."
ETA: CEV, perhaps?
Wouldn't "Everyone should do what my moral code says they should" be subjective nonrelativism? Surely there are lots of people who believe that.
Less Wrong is extremely intimidating to newcomers and as pointed out by Academian something that would help is a document in FAQ form intended for newcomers. Later we can decide how to best deliver that document to new Less Wrongers, but for now we can edit the existing (narrow) FAQ to make the site less scary and the standards more evident.
Go ahead and make bold edits to the FAQ wiki page or use this post to discuss possible FAQs and answers in agonizing detail.