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This plugin has no options. It simply adds a column before the title (far left) the show's the posts featured image if it's supported and/or exists.

Add a defualt image simply by filtering you own image in. Use featured_image_column_default_image or filter your own CSS by using featured_image_column_css.

Add support for a custom default image

function my_custom_featured_image_column_image( $image ) {
    if ( !has_post_thumbnail() )
        return trailingslashit( get_stylesheet_directory_uri() ) . 'images/featured-image.png';
}
add_filter( 'featured_image_column_default_image', 'my_custom_featured_image_column_image' );

Add your own CSS to change the size of the image.

/**
 * @use '.featured-image.column-featured-image img {}'
 */
function my_custom_featured_image_css() {
    return trailingslashit( get_stylesheet_directory_uri() ) . 'css/featured-image.css'; //URL to your css
}
add_filter( 'featured_image_column_css', 'my_custom_featured_image_css' );

For question please visit my blog @ http://austinpassy.com