I would like to see an update where you can enable inventory tracking on items which did not previously have it enabled, even after transactions have been made with this item.

You would simply set the system to record the inventory on the item from that day forward.

The reason for this is for example if you have a company which drop ships a particular item, then decides one day to inventory it - you cannot utilize that item already in books and have to create another one. This can become a mess, especially since you cannot use duplciate sku's (which makes sense). If this happens for a variety of products, you end up with a very messy system.