Personally, I’m really not a fan of this, but the current development branch of the plugin does have a filter built in for it.
If you want to try it on your site, you’ll want to replace the entire plugin with the current development branch of the plugin. This branch is still in development but is working for me, but just so you know in case you run into something unexpected.
You should be able to just upload/overwrite the files using FTP.
Then you would add this filter to your functions.php file:
add_filter( 'display_featured_image_genesis_force_backstretch', 'prefix_force_backstretch_image' );
function prefix_force_backstretch_image( $post_types ) {
$post_types[] = 'post'; // whatever post type you want to force the backstretch images on
$post_types[] = 'page'; // whatever post type you want to force the backstretch images on
return $post_types;
}
This will force all featured images to use the backstretch feature, unless they are smaller than your site’s “medium” image width. Using this filter may result in some funky behavior, or fuzzy images due to their being stretched too far, so YMMV/use at your own risk.
