Is there anything to identify these Products other than their products_id ... such as the master_categories_id where the master_categories_id always has this extra charge?

Do you just want to disable the Free Shipping Options freeoptions when these Products are in the Cart?

Or, do you want to disable the Free Shipping Options freeoptions shipping module and disable the USPS and UPS and activate a customized shipping module that only charges the extra charge per Product x quantity x extra charge for these Products?

Or, do you want to disable the Free Shipping Options freeoptions shipping module and add an extra charge to the USPS and UPS shipping charges for these Products for Product x quantity x extra charge ...