Overriding of Nette\Configurator

bootstrap.php

<?php

require_once __DIR__ . '/models/MyConfigurator.php';
Nette\Environment::setConfigurator(new MyConfigurator);
Nette\Environment::loadConfig();

Nette\Environment::getApplication()->getService('Nette\Web\IUser') instanceof MyUser;

config.ini

service.Nette-Web-IUser.factory = MyConfigurator::createUser

MyConfigurator.php

<?php

class MyConfigurator extends Nette\Configurator
{

	public static function createUser($options)
	{
		$user = new MyUser();
		$user->authentificationHandler = Nette\Environment::getApplication()->getService(...

		return $user;
	}

}