In object window, artifacts already show first before any other items, and in purple.
Unidentified artifacts should definitely not show on the floor by some recognizable color. If that is what you meant. Stealthy character with enlightenment would have even easier time collecting endgame stuff. There are enough artifacts already you can spot in their unid'd form. Light sources and (correct me if I'm wrong) the Rings of Power. Ruby -> Narya. Sapphire -> Vilya. Nenya flavor I don't remember.
If you're talking about highlighting already identified artifacts on the floor, I'm not sure what the gain is? Do you have object window open on your games at all?
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