It would be cool to have the option to feast on dead bodies, maybe restore you health a little bit.
The way I see it, it could work by: equiping knife, using the knife on a dead body, human meat would be added to your inventory which can then be eaten.
Of course there is no animation for eating corpses so you'd be forced to either use the regular action animation, or perhaps the knife attack animation.
Maybe to add a downside to cannibalism, once you harvest the meat you lose some reputation with some of the more civilized factions.
Just my thought, think it would be cool