I think that a cool addition for the next patch would be the ability to steal from shopkeepers and scavengers. They would be really hard to kill but they would drop all of their loot if they were killed, and some extra gold if they were successfully backstabbed. You could even add a rogue ability called pickpocket that would allow you to steal from an npc that did not notice you and gain more gold than if you had killed them. It would go off intellect. Just some ideas I came up with while playing through the game with a rogue.