According to Dean in the forums:

> Let me summarize what I think the behavior should be:
> 
> - On the home screen, show the power button (icon and container)
> immediately by default..
> 
> - When entering the home screen, hide the power button if (and only
> if) there was a touch in the area that the button would appear in the
> last second. Show the button after the area has not had a touch for
> more than one second.
> 
> What this means is that if you get to the home screen by any means
> besides touching that area (i.e. the back button or home button), the
> button is already there. If the user used the home, power or back
> button to get home, hide it until they have not touched for one second
> (this bit is to avoid them tapping back repeatedly, or holding down
> the the button, and accidentally turning off.

http://forums.slimdevices.com/showthread.php?t=64180#post429866