You could customize the Item Rate item shipping module, I recommend cloning it otherwise it will get overwritten in an upgrade ...
Find the code for:
Code:
// class methods
function quote($method = '') {
global $order, $total_count;
// adjusted count for free shipping
$item_total_count = $total_count - $_SESSION['cart']->free_shipping_items();
$this->quotes = array('id' => $this->code,
'module' => MODULE_SHIPPING_ITEM_TEXT_TITLE,
'methods' => array(array('id' => $this->code,
'title' => MODULE_SHIPPING_ITEM_TEXT_WAY,
'cost' => (MODULE_SHIPPING_ITEM_COST * $item_total_count) + MODULE_SHIPPING_ITEM_HANDLING)));
And customize the cost to manage the highest you want to charge ...
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