Hi,
With the random option turned off and the ordering direction in descending order, you'll get the products with 1 in that field before the products with 0 so that's a way of filtering.
But then, you can't have them display randomly.
If you configure a menu item instead of a module, with filters, it's possible to force such rule thanks to parameters in the URL.
For for a module, it's not possible to do that as filters only apply to menu items.
The last option is to develop a small hikashop plugin implementing the onBeforeProductListingLoad trigger to add your extra condition on that custom field when you want it:
www.hikashop.com/support/documentation/6...reProductListingLoad