I know of no specific danger in shifting an AT into neutral. You need to be EXTREMELY careful when switching off the ignition that you don't lock the steering column. It would be better to
* switch to neutral
* safely exit the road and stop
* turn off engine
I am glad you have practiced it.
My concern is over the code running tiptronic transmissions, they are computer controlled manual transmissions where you no longer have an effective physical connection.
There was a programme on TV here in the UK a while back which featured an incredibly cost-conscious (read: mean) guy who turned off the ignition of his holiday hire car "to save money" while going down a winding mountain road in Spain. The steering locked and the car went over the side. Luckily he and his family survived and they were able to slaughter him on national TV over the incident.
My experience has been that switching the ignition from "run" to "accessory" doesn't risk locking the column, but now that I think about it, dropping the transmission into neutral should suffice -- the only concern I'd have there, with a runaway throttle, would be that it'd wreck the engine to have it running flat out with no load.
The engine will only be run at max for 15-30 seconds until you pull off, it will be fine. Better that than a potentially fatal accident. Only hardware after all.
* switch to neutral
* safely exit the road and stop
* turn off engine
I am glad you have practiced it.
My concern is over the code running tiptronic transmissions, they are computer controlled manual transmissions where you no longer have an effective physical connection.