add the security:

Hi mojeprogramy.com

“The possibility of determining at what address should be seen not only the / login but for example, / my-login, / my-login / mysafelogin”

This feature is not in progress yet. Maybe in a future version. Until now, the main goal was to check the plugin efficiency.

“The error message is standard and easy to catch, so should the redirect page 404”

Available via hook with the new version 1.0:

remove_action( 'sfml_wp_login_error', 'sfml_wp_login_error' );
add_action( 'sfml_wp_login_error', 'my_wp_login_error' );
function my_wp_login_error() {
	wp_safe_redirect( home_url() ); // Redirect to the home page
}

You can also use your own wp_die() and return a 404 error code instead.

Regards.
Greg