Add option to turn off page curl

Would it be possible to add an option to turn off page curl on the thumbnails? The thumbnails look a lot better again non-white backgrounds without the page curl.

I added the following code to change the behavior on my site.

$imageLink = str_replace("&edge=curl", "&edge=nocurl", $imageLink);

https://www.ads-software.com/extend/plugins/google-bookshelves/