Store images sorted by name when dropped as group

-- HikaShop version -- : 2.3.5
-- HikaMarket version -- : 1.5.1
-- Joomla version -- : 3.3.6

In a massive process of data entry I'm throwing sets of 6 pictures in the image drop area in product frontend edition.

The problem is that there is no apparent logical criteria on how they get sorted there. I believe they just show by the order they have been stored in the system so the smaller ones always show as the main and first pictures.

I drop my sets ordered by name from 01 to 06 in a single drag&drop operation and I would like this order to be respected so the criteria would be filename ordering.

How can this be fixed? I believe this is a major need for most users.

Jerome wrote: But once the image uploaded, you can drag&drop them in order to change the ordering (and save the product to apply the modifications).

Yes of course, but this is precisely what I want to avoid, having to reorder them product by product picture by picture.

Is there no way to change the ordering criteria to honour the alphabetical name order?

This sounds worth to try. But, is there some way that onBeforeProductSave differentiates between the first time a product is saved and all other times?

I mean, would make sense that a supposed onBeforeFirstProductSave would do the ordering and on later editions the user ordering if ever changed would be respected.