Controller Callback or Hooks when using additional class paths

Here is the setup. I am using cakePHP 1.2. I have a User/Content
Management System, at the same level of the cake core. Similar to
WildFlower CMS. I use cakePHP's additional class paths to include the
code. I have it up and working, but when I want to customize the
User Controller, I have to copy the whole controller into my app
directory, and modify the code. I want to be able to keep theUser/
Content Management completely seperate from my app, so I won't have
to diff the code everytime I make a change. How can I create a
callback system, that triggers before, or after an action in the
management system fires, and have it trigger a controller/method in
my App Directory. I found this code in the AppController of
WildFlower, but it still seems to not work. I guess it is still
under construction.

/**
* @TODO Under construction
*
* Launch callbacks if they exist for current controller/method
*
* Callback for controllers are stored in <code>app/controllers/
wildflower-callbacks/</code>.
* The name convencions is unserscored class that you want to plug
into with "_callback"
* suffix. Examples:
*
* - pages_controller_callback.php
* - comments_controller_callback.php
* - wildflower_app_controller_callback.php
*
* @param string $when Launch <code>before</code> or <code>after</
code> current action
*/
function wildflowerCallback($when = 'after') {
// app_controller
if (class_exists('AppControllerCallback')) {
$plugin = new AppControllerCallback;
foreach (array('beforeFilter', 'afterFilter') as $filter)
{
$method = $filter;
if (method_exists($plugin, $method)) {
$plugin->{$method}();
return;
}
}
}

$className = Inflector::camelize($this-
>params['controller']) . 'ControllerCallback';
if (class_exists($className)) {
$plugin = new $className;
$method = $when . '_' . $this->params['action'];
if (method_exists($plugin, $method)) {
$plugin->{$method}();
return;
}
}
}

I definitely can use help on this. Thank you.

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