I have action camera with retarded user interface. To turn it on I have to: press main button for at least 0.3s but no longer than 2s, then I have to wait until it beeps, then I have to wait for 3s, then I have to press second button for at least 0.3s but no longer than 1s. Then I observe main led, if it blinks the camera is recording, if not I need to press second button again.

With tiny mcu like this one, I think it would be possible to add a bodge inside that would turn on recording automatically after single press of button. The MCU needs to be really tiny to fit inside camera.