以下の具合で情報の追加をしてみました。
また、 $this->arrSearchDataへも値を追加済みです。

しかしながら、反応しません。
（ 'comment10' => $this->arrForm['comment10'],
'product_sub_activity_area' => $this->arrForm['product_sub_activity_area'],
'product_status' => $this->arrForm['product_status'],
'product_status' => $this->arrForm['category_id'],
'ground_info' => $this->arrForm['ground_info']）

public function lfGetSearchConditionDisp($arrSearchData)
{
$objQuery =& SC_Query_Ex::getSingletonInstance();
$arrSearch = array(
'comment10' => '指定なし', 'ground_info' => '指定なし', 'product_status' => '指定なし', 'category_id' => '指定なし','product_sub_activity_area'=>'指定なし');

$arrSearch['comment10'] = $arrSearchData['comment10'];
$arrSearch['product_sub_activity_area'] = $arrSearchData['product_sub_activity_area'];
$arrSearch['category_id'] = $arrSearchData['category_id'];
$arrSearch['ground_info'] = $arrSearchData['ground_info'];
$arrSearch['product_status'] = $arrSearchData['product_status'];

}