This is what was done. My inventory remained un touched. So all my products is set to 100 000 in stock. This way they will never become out of stock
An extra field was put in where you upload new products called "stock indicator" and in there you specify the amount that is in stock. Also, if "stock indicator" = 1 or above it will display in a language variable on my site in green - "In Stock Now" and everything in my "stock indicator" that is 0(zero) will display on my site as "Pre-order" in orange. And therefore xcart allows you to checkout because you have 100 000 in stock even if you have Zero
Works for me!