I have created a small search and filter form with a POST action in controller/index, which POSTs to itself the conditions and fields to paginate ($this->paginate($
You can use passedArgs.
in the method controller :
if ( empty($this->passedArgs['search']) ){
$this->passedArgs['search'] = $this->data['YourModel']['search'];
}
if ( empty($this->data) ){
$this->data['YourModel']['search'] = $this->passedArgs['search'];
}
in your view :
$this->Paginator->options(array('url' => $this->passedArgs));