By the way, the Crop feature (“B” above) exists within WordPress. You can pass the ID of the image attachment to this page and clicking on “edit image” shows a crop tool.
/wp-admin/post.php?post={$attachment_id}&action=edit
Perhaps it wouldn’t be that hard to add a link to this page next to each CFT image thumb (and perhaps a hook that via JavaScript auto-clicks “edit” and hides everything else (excerpt, alt text)).