Post Carousel (so-widgets-bundle): Landscape and portrait pictures

Hello,

I would like to use different picture formats (landscape and portrait) in a carousel, but can’t complete it like pictures used by the carousel are always cropped.

Changing the “crop” attribute parameter here (post-carousel.php) as no effect:

add_image_size( 'sow-carousel-default', 272, 182, false );

Changing this line in item.php (using the “fullsize” value)

$img = siteorigin_widgets_get_attachment_image_src( get_post_thumbnail_id(), $settings['image_size'], $settings['default_thumbnail'] );

to

$img = siteorigin_widgets_get_attachment_image_src( get_post_thumbnail_id(), 'fullsize', $settings['default_thumbnail'] );

is doing the job, but not satisfying, like it will be lost with each plugin update.

What would be the way to set a carousel like desired ?
Thanks a lot for your help.