It would be great to be able to upload supplier invoices and to have the ability for them to be "approved" for payment by one or more parties and for this "approval" to be a digital stamp. If that makes sense? Currently we have to print supplier invoices, date stamp them, stamp them with an "Approved by" stamp which is then signed and dated, and then we have to re-scan the approved invoice ready for payment. There are software products out there for this which integrate with other accounting systems, but they are aimed at large businesses and so they're prohibitively expensive.