Vendor commission calculation

I am using Product Vendors in my WooCommerce application.

I just found that vendor commissions are calculated per product in the order. However, I expect the calculation be on the total price of an order, assuming all products are from one vendor. The difference of these two way of calculation is a few pennies due to rounding up/down, depending on number of products in the order. Unfortunately, it could be a source of mistrust or suspicion from vendors.

Is there any way I can instruct WooCommerce to calculate commission on the total price of an order rather than on each individual product?

Thanks for advice

John