I would like to see a pin that is input by button combination. This will keep kids or other people from visually watching you hit the numbers for the pin. The web version hides and you can enter by keyboard, but the Nvidia Shield App still shows numbers. Not sure about other devices.
There’s already an existing feature suggestions discussing what you’re asking for.
I suggest you comment/vote in that threads in order to help us avoid distracting or cannibalizing votes.