A very small addition that will help store workers not miss a very important moment when picking up an order if two or more identical products are bought. Better explain by example: We ourselves work in an online store and very often (almost every month) there are orders in which there are two or more identical products. Workers complete parcels and almost always miss such a moment - only one item is taken . Then the unhappy customers call, they take offense, we immediately send the missing goods at our own expense, etc. In general, unpleasant moments ...
     
Put this necessary very small addition and if the number of identical products is more than 1, it will display an amount in the large red font on the order page so that workers will not miss this moment.
I tested on version 1.5.5.1 but I think that it will work for all versions 1.5. If not - write to you personally for free.