Back in 2E, for a short time we had a kender PC (from DL) in our FR-party. The idiot started to pick our character's pockets as well, but not for long. The wizard warned the kender, that should the little snot ever "find" one of the wizard's items again it would be fireball time until nothing but ash remained. The rest of the PCs were a bit more mellow - they just took to grabbing the kender each morning or evening or whenever they felt like it and strip-searching him. The kender became an amusing party member for the short time until the player tired of getting his own medicine force-fed back. (His next characters were not really better team-players, but no kenders, at last.)