RE: Turning the speed limiter on permanently?
As much as the idea is good, I'd not want to risk the possibly never occurring situation where I needed to accelerate above the set speed for safety reasons. Avoiding an accident can be done with the accelerator as well as the brake. Imagine sitting on the middle lane on the motorway and the car on the inside lane pulls out but doesn't see you. You're boxed in behind and to your right - the only way to avoid them may be to accelerate...if you're doing 75mph, and are limited to 75mph, they will hit you.