Just wanting to know if there is a way when you select a free product (where there are multiple products to choose from) to have the image as the button and not the little circle (or both). It is very hard to see the circle selector..
Use css. See the files in the templates directory of my plugin for the used class names. If you need to override the html output, copy the files to the woocommerce-auto-added-coupons dir of your theme.