I love the idea but the scanner is a bit slow and mostly I get impatient and enter the pin
I wonder if that's because your pupil should be wider when you're wearing sunglasses so it's easier to see your retina. I noticed today it wasn't working as well for me in bright sunlight today
why not just switch the "require sign in" to "never" when you're driving so you can use Hey Cortana then switch it back to something more secure when you're not driving?
I wish phones had the ability when connected to certain WiFi networks or when connected to certain BT devices it would just automatically stop requiring entering a lock code. Connected to my home wifi? Disable the lock code without me doing anything. When connected to my truck's BT? No lock code required. That would be so nice. Not worried about it - if my truck gets stolen with my phone in it I have bigger fish to fry...