After reading the whole 3 pages of this thread while downloading something (couldnt see one image, except for the sketch that I could not understand very well ^^ I thought of somehting, about the fingerprint reader...
You could find a way to print a fingerprint on some kind of tansparent layer, and by sticking the stuff with leds of the color of your choice, black colored layers and other stuff, you could make some kind of fingerprint display that would light up when you press it. If you got the time to play with a little mechanism, you could make the led(s) move up and down while you press it. The ''switch'' would be activated when you press the ''reader'' by a spring and some kind of button (i suddenly thought about xmastree's 386 case and its new power button, you could get something similar done, but instead of the original 5.25 stick it would be your reader).
I know that some motherboard will leave the power LED lit when they are shut down, not at full power tho, but you could lit your reader with the power led when its shut, and gives some light when it's powered, and by using another led connected somewhere else, to give the light fx wanted.)
Simple suggestion tho, but I really liked the fingerprint reader. Hope I have helped for yoru choice.