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No.

 I'm pretty sure you can't override a specific setting i.e. Auto but with - .5 EV.

You'll have to make that adjustment manually every time.

ABL68 is right you can create your own presets but they'll only work on images that were taken under the exact same lighting and exposure conditions.

It would work best if you set a specific white balance  and manual exposure settings , in a stable unchanging environment.

If your camera is set to Auto white balance and you use any camera setting than may change the exposure values it won't work very well.