Hi Andrew - unfortunately that adds a 5th menu item to the Power menu so this means even more button depressions or touch screen clicks in order to select it It also isn't quite the same as the 770 cover-on event as WiFi/BT isn't disabled, although the touch screen is disabled entirely so it's better than "Lock touch screen and Keys" in that respect.

It may be possible to make "Soft poweroff" the default option if the power button is depressed for a long time, but it isn't really a replacement for the cover-on event and the Power button (due to it's size and recessed position) is not a pleasant button to use for such a common function (if you get an N800 I hope you'll understand!)

My ideal would be to put the N800 into the 770 "cover-on" state by using one of the easily accessible front-facing hardware buttons - these are easy to press in a hurry whereas the top buttons are not (least of all the Power button). A menu from which to select a subsequent power state only delays the process so the cover-on state should be selected without any further screen interaction - eg. double-click the Home button and bam, everything is powered down and disabled until the device is resumed with another double-click Home (or perhaps Home + d-pad center).