Err, actually, the power switch can do just that, be a power switch:
short slide/click: sleep/wake
longer (~7s) slide/click: poweroff
really longer (~20s) slide/click: hard reboot (via a short soft unplug of the battery)
(By longer I mean slide and hold before releasing for devices with a power switch, and press and hold before releasing for devices with a power button). (And this applies to eInk devices).
Last edited by NiLuJe; 09-24-2012 at 12:28 PM.
Reason: Fix (I had poweroff/reboot in the wrong order), add timings, and confirm that it works on newer devices with a button