Understanding that the "sel" radio in options on a product, Determines which option will be selected as default of a product on a category or product style page....

How can I pass this value or change it based on the particular category page for example. Lets say in one category "Blues" the products, shirts and pants for example have a default color value of Blue, and for the Category "Reds" have red as a default color.

I am thinking this will be something like I did to change the default dropimage behaviour to change the "LARGE" image as someone described in another forum post.

Is there a simple way for a non programmer like me, to copy a listing_style and set the default value, to something different than what is in the database? for product listings and category styles