Is your droid a phone or a tablet?
I see it not making much sense to have configurable auto-power-down abilities in the Android OS for phones, since if they're off they're not taking text messages, calls, etc. But Android is also used on tablets, and tablets (sometimes) don't get used for days on end.
I really wish that Android would include an auto-shutdown option in the OS, or at least make the power down toggle accessible without requiring root permissions so people could install a normal app to do this for them. I don't necessarily want to root my tablet, but I especially don't want to constantly come back to find it a useless dead brick...