How to add shapen parameters?

Is it possible to add sharpen parameters as an option or add them to imagemagick-engine.php?

The WP plugin ImageMagick Sharpen Resized Images works with these parameters:

function imagick_sharpen_resized_files_register_settings() {
	add_option('Radius','0');
	add_option('Sigma','0.5');
	add_option('Sharpening','1');
	add_option('Threshold','0');
	add_option('CompressionQuality','92');
	add_option('AutoConLev',1);

Thanks, Thomas