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runscottCards are fairly easy to identify and all of the major slabbers have still managed to screw it up, some on a regular basis. Identifying the authenticity, generation, etc., of photos is much more difficult and I doubt the slabbers could handle it, although I'm sure they'd try if they thought it could make more money for them. Also, it would add the incentive to trim the photos. I'm also against it for aesthetic reasons, but that's just personal preference.
So while I can't think of anything additional that needs to go into slabs, I can recommend removing the following: reprints, wax packs, hand-cut cards...JMO