Product to cart -> new item instead of increasing

Hi,

There is no option for that.
It could be done with a custom item field (that you would create via the menu Display>Custom fields in the Business edition), a customization of the "show" file of the "product" view via the menu Display->Views so that the custom field is always initialized to something else, and some CSS to hide that custom item field.
As the field would be different each time the user add the product, it would be on a different line of the cart.

Yes, that could be done by editing the file "quantity" of the view "product" via the menu Display->Views.

Something like that at the beginning:

$cartClass =& hikashop_get('class.cart');
$cart = $cartClass->loadFullCart();
$already = false;
if(!empty($cart->products)){
 foreach($cart->products as $product){
  if($product->product_id==$this->row->product_id) $already = true;
 }
}

if($already) return;