Hi Ben. How about a Pan/Tilt tripod head, that tracks to an armband or necklace transmitter, or some other item the person wears. Say for example you have a person on stage walking around speaking. It will let a camera follow them (perhaps using heavily geared stepper motors to give a slowish Pan/Tilt speed, but smooth. In firmware you can even have soft-start and soft-stop to the movements.
Would be good for B reel shots, also as a backup to your main camera.
Thanks
Peter