If you’re a Nook Color owner and would like a menu/back key for times when the notification bar is not displayed, look no further!
XDA forum member bpk originally tried changing the key layout to map the hard volume up /down keys to the menu/back functions. However on second thought, he thought the hardkeys may not stand up to the wear and tear so decided to hack up an app to create the desired soft keys.
The hack works so that pressing the Nook button brings up the app. It then runs a program on your device to inject the hardware keys, as root – and hence superuser access is required.
For more information and to download the apk, head on over to the modification thread._________