First thanks for your module, it's a very helpfull one.

I join my opinion with arbel especially on the weight consideration. Most of transporter (to not say all) give price table based on the weight and the country destination, so the weight cannot be ignored.

When I say weight, I think weight of the total order, not the weight of each product (Because most of the transporteurs take care about the total weight of the package, they don't open them to weight each products in it.

In addition, some countries have custom tax and a field that allow to add a custom tax for a defined country could be really good and usefull.