They have packaged BSNES into a nice library now that for most people would probably suit their purposes just fine. The RetroCopy SNES core will be based off the information byuu and others have found and other documents. I can't used bsnes source code in RetroCopy and also wouldn't want to because it isn't in form of the other cores in RC. There's no point adding some alien core to RetroCopy for such an important system like the SNES. I'd like it to be up to scratch like the rest of the cores.