AMI_Event::addHandler('v5_on_before_init', 'handleEshopInit', AMI_Event::MOD_ANY);

function handleEshopInit($name, array $aEvent, $handlerModId, $srcModId) {
	$aPageInfo = AMI_Registry::get('page');
	if(!empty($aPageInfo) && $aPageInfo['modId'] == 'eshop_item') {
		//$elementsPerPage = AMI::getSingleton('env/request')->get('elements_per_page', 0);
		$elementsPerPage = 1;
		if(intval($elementsPerPage) > 0) {
			AMI::setOption( 'eshop_item', 'page_size', $elementsPerPage);
		}
	}
	return $aEvent;
}

http://business.amiro.ru/katalog/internet-magazin/dlja-znanij/konstruktory/elementnye?&ext_custom_11=%D0%BC%D0%B0%D0%BB%D1%8C%D1%87%D0%B8%D0%BA%D0%B0%D0%BC&pf=1&flt_force_values=1&action=rsrtme

phpoid:
http://manual.amiro.ru/docs/api6/eventlist.html
попробуйте событие "v5_on_apply_filters".

$aEvent['sql_part'] = "AND i.lang='ru' AND (i.public = 1 ) AND (i.public_direct_link=0 ) AND (date <= NOW() )"

// "_local/front_functions.php"

AMI_Event::addHandler(
    'v5_on_get_list_sql',
    'handleV5OnGetListSQL',
    AMI_Event::MOD_ANY
);

function handleV5OnGetListSQL($name, array $event, $handlerModId, $srcModId)
{
    // 'cms_es_items' can be obtained using API
    if (FALSE !== mb_strpos($event['sql_from'], 'cms_es_items', 0, 'ASCII')) { 
        $event['sql_filter'] .= "AND (i.public = 0)";
    }

    return $event;
}

function handleEshopFrontFilter($name, array $aEvent, $handlerModId, $srcModId) {
    if(
        $aEvent['mod_id'] == 'eshop_item' &&
        $aEvent['sql_prefix'] == 'i.' &&
        in_array(
            $aEvent['viewType'],
            array(
                'body_items',
                'body_urgent_items',
                'body_filtered',
                'body_search'
            )
        )
    ) {
        $aEvent['sql_part'] .= 'AND i.custom_field_XXX = "RU"';
    }
    return $aEvent;
}