Hi,
1 and 2. If you're a developer, you can modify the file product / show_block_img.php with custom JS / HTML / PHP code to add these capabilities the way you want them.
If you're not a developer, you'll want to use an extension like the ones offered by MagicToolbox:
www.magictoolbox.com/hikashop/
3. You want to edit the layout view file show_default or show_reverse or show_tabular via the menu Display>Views. There, you'll find the div hikashop_product_left_part where you'll be able to change the class.
To know which view file to edit exactly, you can activate the "Display view files" setting of the HikaShop configuration as explained here:
www.hikashop.com/support/documentation/1...-display.html#layout