You guys ARE the dungeon mobs, but those artifacts stolen from local merchants have to find their way to the lich's tomb somehow. I wasn't aware that you're shooting for trapsmith though- pretty fantastic choice if you ask me. The current head of the Trap Department might take an interest in you. Anyway, in my experience rogues work better in concert, and I'm liking the angle for Trapsmith. If you feel that the Kobold Rogue is the best fit for the character you want to play, I don't have a problem with it.