Shipping based on weight and distance

I recently made a contract with a national courier and i need to compute the shiping based on the weight of the order and of the distance to the city.

The formula would be: Shipping = flat amount + order_weight * weight_percent + distance * distance_percent.

I have the table with all required distances and it would not be a problem to import it in database.

I think that this would be a very useful improvement of hikashop as most of the couriers apply this formula for computing shipping cost.
Thank you.