Square miniatures or bullets in products DEBUT

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I would love to make my product pages looks more professional, so I wish to make all the miniatures of product square or change them to bullets. I am using Debut.
Could someone assist?
I have 200 products with 5 or more pic each and changing them all 1 by 1 to square size would be a nightmare. I do not wish to crop the original pictures I would like to crop only the miniatures.