Not sure if it has been mentioned. I noticed today with the latest firmware when keyboard lock is on, if you happen to press any button the activity light does not flash - leading me to believe that the press does not register at all thus saving power.
This is different to the previous version where if you had the keyboard lock on and presses a button the activity light would flash (but nothing would happen on the screen being in lock mode) - hence using power.
So it seems for those of you who carry your PP around in your bags/pockets that during keyboard lock an accidental press of a button will not cause battery usage if using the latest firmware. This latest update IMHO is a damned good update.
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