Product CSV Import Suite for WooCommerce

We get restock every week on items that arent necessarily out of stock, we would love to use the embedded CSV importer, but it needs a CHANGE STOCK function instead of the current REPLACE function. We get over 500 replacement SKUs each week, if we could just have a column of the items qty at arrived and it would add it to the currently quantity it would save hours of time over the current option of checking inventory and then adding the restock number (at that point I might as well do it manually).