No I think it shows that kill cords are not user friendly
I think that there is scope for big improvement. A couple of ideas jump to mind:-
On some plant, like mini diggers there is a sensor in the seat that will not allow the digger to move unless someone is sitting there.
Some delivery drivers, to allow them to keep there vehicle running without them in it, have a transponder ‘credit card’ that they keep in the back pocket that has to be there for the vehicle to be moved.
Both these systems could be used on a rib and in the case of the second it would allow you to move around the boat when a kill cord would not.
how would you make the sensors waterproof though if you took a load of water on board?