Libec used to make one of the specialized zoom controllers for Sony’s EX1/EX3, and they worked well. Too well! By taking the EX1 pigtail off, you could use it as a zoom controller with Canon’s B4 broadcast lenses. I once had a shoot where I gave the cameraperson a $2000 Canon zoom controller designed for finesse moves on mobile cameras. He actually preferred the Libec!
Well, they’ve just come out with some LANC zoom/focus controllers, and they look pretty nice. They are also launching a monopod with a wide locking base that makes a lot of sense for some run and gun situations.