I think this is a contribution with nice components like the batch-status update and the possibiltity to split orders. But there are much components not really needed. I think the most used payment in online-shops is creditcard and may be payment in advance by wiretransfer. For the booking of the payments nobody needs a zen-shop for this there is financial software, but I never found a contribution what do the order editing in the right way. The shop calculates the tax in a correct way but after the editing the tax is away and all prices are net.
Maybe that it is the way in the United States, at Germany we have to show the user what he have to pay so all prices must include the tax but no order editing contribution do that. It is possible to add products and edit the quantity but at the end you have to correct the order totals with phpMyAdmin.