All settings you can find in BeRocket_image_watermark class in static variables $defaults.
public static $defaults = array(
'disable_image' => '0',
'shop_thumbnail' => array(
'ratio' => array(0 => '1', 1 => '1', 2 => '1', 3 => '1', 4 => '1'),
'text' => '',
'text_alpha' => '30',
'text_angle' => '0',
'font_size' => '20',
'image_count' => '0',
'image' => array(0 => '', 1 => '', 2 => '', 3 => '', 4 => ''),
'top' => array(0 => '25', 1 => '25', 2 => '25', 3 => '25', 4 => '25'),
'left' => array(0 => '25', 1 => '25', 2 => '25', 3 => '25', 4 => '25'),
'width' => array(0 => '50', 1 => '50', 2 => '50', 3 => '50', 4 => '50'),
'height' => array(0 => '50', 1 => '50', 2 => '50', 3 => '50', 4 => '50'),
),
'shop_single' => array(
'ratio' => array(0 => '1', 1 => '1', 2 => '1', 3 => '1', 4 => '1'),
'text' => '',
'text_alpha' => '30',
'text_angle' => '0',
'font_size' => '20',
'image_count' => '0',
'image' => array(0 => '', 1 => '', 2 => '', 3 => '', 4 => ''),
'top' => array(0 => '25', 1 => '25', 2 => '25', 3 => '25', 4 => '25'),
'left' => array(0 => '25', 1 => '25', 2 => '25', 3 => '25', 4 => '25'),
'width' => array(0 => '50', 1 => '50', 2 => '50', 3 => '50', 4 => '50'),
'height' => array(0 => '50', 1 => '50', 2 => '50', 3 => '50', 4 => '50'),
),
'shop_catalog' => array(
'ratio' => array(0 => '1', 1 => '1', 2 => '1', 3 => '1', 4 => '1'),
'text' => '',
'text_alpha' => '30',
'text_angle' => '0',
'font_size' => '20',
'image_count' => '0',
'image' => array(0 => '', 1 => '', 2 => '', 3 => '', 4 => ''),
'top' => array(0 => '25', 1 => '25', 2 => '25', 3 => '25', 4 => '25'),
'left' => array(0 => '25', 1 => '25', 2 => '25', 3 => '25', 4 => '25'),
'width' => array(0 => '50', 1 => '50', 2 => '50', 3 => '50', 4 => '50'),
'height' => array(0 => '50', 1 => '50', 2 => '50', 3 => '50', 4 => '50'),
),
'custom_css' => '',
'plugin_key' => '',
);