It would be great to have some custom fields on the sales entry screen. This question comes up very regularly with clients who are importers/exporters and also with mechanics. They often have extra information they want on the invoice (that they don't want included in the body) and are already using all the fields such as Salesperson, Ship Via & Comment etc. Ideally some fields they can name themselves (so that they don't need to think what am I using the ship via for?)
"Custom field on sales screen"
