Is this a bad idea? What do you think?

To help with auth and acl I made an action helper that automatically
checks permissions on preDipatch.

My question is would it be bad practice to setup the acl for that
controller in the init like this:

    public function init()
    {
                $acl = $this->_helper->getHelper('Auth')->getAcl();
                
                $acl->add(new Zend_Acl_Resource('default'));
                $acl->add(new Zend_Acl_Resource('default.error'), 'default');
                $acl->add(new Zend_Acl_Resource('default.index'), 'default');
                $acl->allow('guest', 'default');
                
    }

This makes it simple for me to manage the acl on a per controller basis
or should I stick all the acl controls in my custom acl class?