To me it seems clear enough that a story marked with a 'snuff' code is one where death occurs not as a mere plot device, but as a specifically erotic treat for the reader (all stories on this site, after all, are supposed to elicit erotic thrills of some kind or the other). I do not see any confusion with snuff movies (no real death was needed, unless the writer wrote a diary) and the word carries sufficient warning. Where there WOULD be a need for a specific code is in the case where corpses are the target of erotic attention ("necro") as quite a lot of people would feel distinctly ill at ease upon encountering such activities unannounced...