Hidden menus for diagnosis and testing?

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2018 Mazda CX-9 GT
I know this one works on my 2018 to access a Diagnostics Menu. It should work on 2016-2019 models.

Press and hold three buttons on your InfoTainment controls:
Music, Favorites, and Mute.

Your InfoTainment screen should turn white with a numeric keypad and three buttons for starting and stopping the various tests and for exiting the menu.

I don't have the car with me at the moment, but there's various options for testing the GPS antenna, speakers, and for reading diagnostic codes.

Anyone know of any other "Dealership only" tools or hidden things on these cars?
 
It would be really interesting if there were more settings that could be changed.

For example, when in "Stop-n-Go Cruise Control" - once it stops you, it then "times out" in about 3 seconds - (forcing you to "resume" to continue) - I'd like to change that very arbitrary time to about 10 secs or more.
 
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