Hello,
1) We use the default WooCommerce function to display related products and don’t have extra options for this https://docs.woocommerce.com/document/related-products-up-sells-and-cross-sells/#section-3 Use Up-Sells slider instead of related products if you want to be able to choose the products to display. Or maybe look for additional plugins that would allow you to change the related products query type.
2) This is the option for the related posts only.
Regards