You dont know the people who hire these things LOL. I have tried the obvious. these guys will carry a battery zipsaw or angle grinder to cut locks etc. this needs to be subtle. if i could find a place to put a hidden switch on a precedent, i would but it needs to be accessible for the shop staff to use. we have had these over two years and everything else we have tried has been found or disconnected. We have considered installing the Visage full control gps system that club car sell, but you can still get the cart to freewheel with the tow/run switch making it an expensive toy that does not solve the issue, as they can then coast it down the hill and crash it.
