I suppose that's what specialized plug-ins like some portrait tools do... Look into that.
I've looked around some. Any suggestions?
try using "match total exposures" under settings?
You can get Lightroom Presets, and I imagine run them as a batch. Start another thread on the Lightroom forum for better information on that.
I am not actually sure about doing this automatically with Photoshop, but you could batch run an Action that applied Levels and or Curves on Auto, and set the default Auto settings to your taste.