activate fingerprint scanner w/o screen blackout

I just noted that my Bank app with fingerprint identification feature, does not need to turn off the display to activate the fingerprint sensor, it merely prompts to place finger on sensor, and the sensor is active and awaiting a print to ID.

On the new fingerprint Tasks and Profiles that Logcat feature has opened up, Id love to see an option to activate fingerprint sensor without the need to black out the display :)