Upgrading 5.1 -> 5.2, index.php to run cron

Hi, in the 5.1 release I added this little code to run cron each hour because I cannot let the provider run the script as explained in some help page.

so I added this in index.php after drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);

		/* Fabio - Run Cron, copyed from cron.php */
		$last_call = variable_get('cron_last', FALSE);
		if ($last_call) {
			if (time() - $last_call > 3600) {
				Run cron dopo un'ora
				drupal_cron_run();
			}			
	    }
		/* Fabio End */

And all worked fine.
Now I see that in 5.2 I have only drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);
Is this a problem?
I can move my code in some other php file?
I can reset DRUPAL_BOOTSTRAP_FULL?
I see there is a poormancron.module, but it is better that my simple code?