I might have known it.
So I have no other chance to develop a own widget which do the modifaction on the spb_products shortcode.
By the way I’ve copied the spb_products function into my functions.php of the child theme because I want to order it by title ascending.
But I see it isn’t possible for spb_mini_products because in the sf-products.php this should be added around the sf_mini_product_items function: if ( ! function_exists( ‘sf_mini_product_items’ ) ) { your code …}.
Maybe you can add it in the next release.
Thanks a lot for the fast response.