On the race boat, we were running a Banderlog controller and had a ball valve attached to the throttle pedal, when the throttle was less than 1/4 open, the spring loaded valve was closed.
When traveling WFO going up a fast running river, you don't have time to be looking around, the high back seats and helmet restraints make it virtually impossible anyway. Running water injection was an option, but it was the only way with Shot Gun mufflers to get it below the sound limit, which at the time was worth 1 minute off your leg time...

I did like the preciseness of the Banderlog controller, I also liked the fact that you could switch it from the dash

I have only seen one failure and turns out it was 100% operator error.....
My only warning would be; Electronics in a boat?

GT