You can certainly go from D to N at speed, I have done it accidentally hitting the gear lever with my hand, but I coast to a stop to re-engage D.
As for changing down, I really don't know, I dare'nt try it. But I would think you would need to engage the lever on the gear lever before selecting another gear.
Personally, I would use what brakes there are, and the handbrake to bring the car to rest.
Visions of a mashed up auto box gives me nightmares.
I'm sure the owners handbook will clarify your question, or the knowledgeable guys on here.
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