Didn't know about the long press. Also good point about the UI showing states clearly for color blind people. While I'm not color blind, the number who are is actually not small and it's easy to keep that in mind when designing UIs.
Yes long press is working but still it is not great. I wish Tesla added some sort of the haptic feedback to the touch screen so that users can get a better feedback if the button is pressed or not. Currently, it is lacking any feel to it.