First, you should tell them that they shouldn't be doing ANY order-fulfillment or accounting based on the emails. They should be using the admin UI for that.
But, you and I both know they'll fire you if you tell them that
So ... you'll have to get your sleeves dirty and alter the code in the create_add_products() method of the order class at /includes/classes/order.php where it builds the $this->products_ordered and $this->products_ordered_html variable contents:
Note that the product description is never stored as part of the order (and frankly in my opinion if the product name and model aren't adequate then the storeowner really needs to rethink things anyway), so if you need the description, you're going to have to run a new query to retrieve it from the database ... a fresh query for each line item in the order.
// build output for email notification