Reply Error Interception

Thanks Includebeer... I did start having a look at doing this, and although it was easy enough to find and change for a similar problem (for 429 response used by the Throttle class, which is in the App folder), when it comes to 403s (which are returned for the csrf filter), all I can find is what looks like the csrf form insertion functions in form_helper.php and Common.php and the place where is thrown SYSTEMPATH/Security\Exceptions\SecurityException.php, which you'll note are all in the system directory and I'm reluctant- for a couple of reasons- to fiddle with).