Not an emergency stop no but slows as if you were applying the brake
You can turn it off
Coasting in gear slows the car depending on what gear you are in so engine braking can be harsh or non existent. Same with accelerating, at the same speed, depending on what gear you are in, you’ll accelerate at different rates for the same throttle input - if you think about it, it’s way more complex
Coasting out of gear is a big no no anyway
In an EV, speed is almost directly proportional to throttle position so it’s v easy to control speed through muscle memory
It’s just different like 2 pedal driving is