Filter ‘simple_urls_slug’ in the legacy version

In the Simple URLs plugin there were the filter ‘simple_urls_slug’ so we can change the /go/ directory into something else:

add_filter( 'simple_urls_slug', 'mr_rewrite_simple_url_go' );
function mr_rewrite_simple_url_go($rewrite_slug_default){
	return 'promo';
}

Does this version has some similar filter?

thanks