Cart subtotal

First of all, that is a very nice and flexible plugin, thank you! It really helped me organize my clients’ messages without having to use PHP codes.

However I noticed one possible omission: the plugin calculates the cart total and not the cart subtotal. I managed to add a nice “Add more US$ xxx to your cart to receive free shipping” message but noticed it would take shipping fees into account (because it is using the cart total, of course).

This is perhaps a rare situation because this problem only manifests itself if the client already chose a shipping option and went back to the store to add more products.