It would be great if GrapheneOS supported the use of fingerprint unlock for a limited, user-specified time after successful passcode unlock (or, perhaps, after successful biometric 2FA unlock). I use pin scrambling and a long PIN, so it would be nice if I could use my fingerprint provided I unlocked with passcode in the past, say, 15 seconds. I would prefer this over leaving the screen unlocked after timeout for 15 seconds and disabling power button instantly locks. although I don't typically use biometric screen unlock due to legal loopholes that allow LE to use biometrics, in safe environments, I'd like to be able to use biometric unlock.