Products listing sorting by price with currency

[Psytanium]

Hello,
 

I'm sorting my products by "final price", after I installed this addon, the listing is corrupted, because now some products have different DEFAULT currency.

 

Anyway, currently this is the code in index.php

case 'PRODUCT_LIST_PRICE':
          $listing_sql .= " order by final_price ASC";
          break;

is it possible, somehow to replace "final price" with

$products_price = $currencies->display_price($product_info['products_price'], tep_get_tax_rate($product_info['products_tax_class_id']), $product_info['fr_currencies_id']);

???? i have posted my problem in the commercial forum if someone interested.

[Psytanium]

all i need is a way to pass the value of variable $products_price to  final price in a query