Pagination : Page One Params Issue

Hello,

I'm using the Pagination class and there is an issue on the first link (to page one).
Variables (or suffix) disapear on it.

If I'm only using

PHP Code:

$config['suffix'] = $request[ 'urls' ]; 


Every links are set except the page one.

If I only use

PHP Code:

$config['reuse_query_string'] = true; 


Every links work.

So as I start with POST variables, I have to do my own pagination system or I miss something ?