Error handling in production

I have two questions for error handling in a production environment.

a) How can I log warnings & notices
b) What's the best way to display custom error pages

This is what I know so far,

I can define app_error.php and create my custom error handlers there.
This works fine for development, but once I switch to production these
errors are replaced by error500.

I can define an appError in app_controller.php, but this doesn't catch
notices, and I see no obvious mechanism for calling my custom error
handlers in app_error.php.

I can overwrite __construct in app_error.php to do something like:

<?php
function __construct($method, $messages)
{
$methods = array('paypal', 'system', 'payflow', 'cart',
'generate');
if (in_array($method, $methods)) {
Configure::write('debug', 1);
}
parent::__construct($method, $messages);
}
?>

But I've been told this is an exceptionally bad idea by the gurus in
#cakephp.

So, I ask, what does everyone else do?

Thanks,
Aidan
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