Are you guys doing anything to lock people out, like a perko with a key in it, or can anybody at any time just come and flip the switch and push the button?
The other thing that I have seen (kinda expensive) is Livorsi has a "Gauge" that has a keypad that you enter a code in to start the boat. I believe it's like 3" round. I was talking to the guy from Livorsi about them and he said it was like $350 for one of them, one for each engine. I like it though because it's a little more "vandal resistant" then just a standard toggle and button.