Hi,
You would indeed have to add these images in the description with the plugin tags.
Now if you're a developper, you can :
- add a column to the "hikashop_file" table in your database via your phpmyadmin
- edit via the menu Display>Views the file of the view which opens in a popup when you edit an image in the backend (you can find which view file to edit by temporarily activating the "Display view files" option of the Hikashop configuration). And in there, add the HTML for a checkbox to file in that new column of the hikashop_file table.
- edit the view file "show_block_img" via the menu Display>Views to display or not the images based on that column just after the line:
foreach($this->element->images as $image) {
If you know PHP, with these indications it should be no problem doing it. Otherwise, you could hire someone to do it for you.