Using it to activate the flashlight was rejected a lot.
So, using it to toggle the "lock" feature in the power menu, would make sense?
This would prevent police etc from forcing you to unlock the device. The duress Pin could be utilized too.
FR: Long press power button to lock fingerprint?
missing-root there is a better workaround, touch the fingerprint sensor with a wrong finger a few times to trigger PIN/password. Or better still, don't use your thumb for unlocking phone, we all know 99℅ of us use it.
DeletedUser69 yes that is a workaround that works.