Customize element settings in visual composer - add, remove, edit component settings

vc_config.php

<?php

//Add in functions.php or any other class file.

add_action( 'vc_after_init', 'configure_vc_btn'); //register
function configure_vc_btn()
{
  //remove params(settings)
	if( function_exists('vc_remove_param') ){
		WPBMap::dropParam( 'vc_btn', 'css_animation' );
		WPBMap::dropParam( 'vc_btn', 'shape' );
		WPBMap::dropParam( 'vc_btn', 'size' );
		WPBMap::dropParam( 'vc_btn', 'color' );
		WPBMap::dropParam( 'vc_btn', 'gradient_color_1' );
		WPBMap::dropParam( 'vc_btn', 'gradient_color_2' );
		WPBMap::dropParam( 'vc_btn', 'gradient_custom_color_1' );
		WPBMap::dropParam( 'vc_btn', 'gradient_custom_color_2' );
		WPBMap::dropParam( 'vc_btn', 'gradient_text_color' );
		WPBMap::dropParam( 'vc_btn', 'outline_custom_color' );
		WPBMap::dropParam( 'vc_btn', 'outline_custom_hover_background' );
		WPBMap::dropParam( 'vc_btn', 'outline_custom_hover_text' );
		WPBMap::dropParam( 'vc_btn', 'custom_background' );
		WPBMap::dropParam( 'vc_btn', 'custom_text' );
	}
  
  //edit a param
	$param = WPBMap::getParam('vc_btn', 'style');
  //Edit param setting list
	$param['value'] = array (
		'Solid' => 'btn btn-solid',
		'Outline' => 'btn btn-outline'
	);

//update in VC
vc_update_shortcode_param('vc_btn', $param);
}