I've not been tempted by fan edits either. I've seen the deleted scenes, some of them add extra context, others create continuity problems. Now that I've seen them, I look at them like some of the viral stuff, if they add a little extra depth and understanding to the film fine, but I don't need them to be recut into the actual film.
I do sort of prefer the Fifield mutation, but it doesn't change anything about the story or what the pathogen does.