Hi,
First, it doesn't load anything more. The pagination is only a bit of HTML displayed on the page.
The products on the other pages are not loaded because the pagination is displayed on the page.
Another solution is to not use the "modules under the product page" setting of the HikaShop configuration to add your module.
Instead, you could use a position of your template to display the module below the product page layout in the Joomla modules manager and configure it to only appear on the product page with the display settings of the module.
In that case, the module won't have any pagination.
I don't think it warrants an extra option for something which can be done 2 different ways already.