Thanks for the info on "payement" and "ramassage".

For the following, here is what I would suggest:

"frais de livraison/montant" is the translation (incorrect I think) for "flat rate/best way"
--> tarif fixe/?? (not sure for "best way")

"option de livraison offerte/livraison offerte" stand for "freeoptions/free shipping". I didnt know how it would print, so it was how I differenciate freeoptions from freeshipper module. I think I will put "Frais de port offert" instead.
--> option gratuite or option sans frais / envois gratuit

"transporteur" is the translation (incorrect too) for "zone rates"
--> what do you think of taux par zone or tarification par zone