Marketpress url rewriting with fixed argument count

I managed to add taxonomy category to product url making to show localhost/products/office/table/product with the help of this url

How to create a permalink structure with custom taxonomies and custom post types like base-name/parent-tax/child-tax/custom-post-type-name
http://wordpress.stackexchange.com/questions/39500/how-to-create-a-permalink-structure-with-custom-taxonomies-and-custom-post-types/39862#39862

May i know how to make the site url with fixed param translation with a custom one.

May i know how to make the site url with fixed param translation with a custom one.

TLDR:

what my problem is, i have
localhost/products/office/chair

it tries to convert this link to
localhost/?product=chair
but i would rather it to do
localhost/?product_category=chair

same with a link with three argument
localhost/products/office/chair/productA
localhost/?product=productA

a link with one argument
localhost/products/office/
localhost/?product_category=office

when i try to switch to

$newRules['products/(.+)/?$']    = 'index.php?product_category=$matches[1]';
     $newRules['products/(.+)/(.+)/(.+?)'] = 'index.php?product=$matches[2]';

from

$newRules['products/(.+)/(.+)/(.+?)'] = 'index.php?product=$matches[2]';
    $newRules['products/(.+)/?$']    = 'index.php?product_category=$matches[1]';

it became like this, the subcategory work but the product will not be found
localhost/products/office/chair/productA
this converts to
localhost/?product_category=productA
an customized search not found is outputed from my custom-taxonomy(category) page

but this time i want it to become
localhost/?product=productA

so if there is a third argument, i want to to become
localhost/?product=productA
if there is only two argument in the link, i want it to become
localhost/?product_category=chair

product_category is registered

register_taxonomy( 'product_category', 'product', apply_filters( 'mp_register_product_category', array("hierarchical" => true, 'label' => __('Product Categories', 'mp'), 'singular_label' => __('Product Category', 'mp'), 'rewrite' => array('slug' => $settings['slugs']['products'],'hierarchical'=>'true')) ) );

and custom post type is registered as follow

'publicly_queryable' => true,
            'capability_type' => 'page',
            'hierarchical' => false,
            'rewrite' => array('slug' => "products/%taxonomy_name%", 'with_front' => false,'hierachical'=>true), // Permalinks format
    		'query_var' => true,

http://wordpress.org/extend/plugins/wordpress-ecommerce/