Automated disabling screen blackout with external power

Does anyone have a solution to automatically defeat the screen blackout, other than turning it off in the screen options, so that the screen will stay on while external power is connected and revert to the set screen saver settings when on battery power.  This would be helpful when using Navigation or other applications that require screen on mode but retain the battery saving function of teh screen blanking.  I have an 8830 with Sprint service.
Thanks to anyone with a suggestion

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