Being the leader of a pretty hard core raiding guild (on my solo character, got no boxing team high enough yet) I decided to be more multiboxing friendly than apparently any other guild on my server.
Since we use dkp, I decided that multiboxed characters in our raids, that could all perform as well as soloed characters, would earn and spend their own dkp.
So a dual-boxing warlock friend of mine raided with us a few times, and each character had its own dkp. (they were able to perform perfectly on even thaddius, better than several of the solo players)