A nice addition would be a skill for tricks like juggling, spitting/swallowing flames, walking around on your hands, doing a cartwheel etc.
Rather than just an addition to RP, this could somehow act as a \'job\'. I personallly dont know much of programming, but probably NPCs could do a small talking sequence/give some Tria if they pass in a sphere around the player. (Referring to the NPCs having schedules and so probably marketing at some time)
Furthermore there could be differences in the value of money, or the radius in which NPCs react.