It would be helpful for payments collected under the wrong client profile to be able to transfer those payments rather than having to refund them and then recollect them.
When invoicing, make the Invoices drag and drop or something to allow to take out an item in a grouped invoice rather than having to create an invoice. If a person were able to grab an invoice item or right click menu an item to place it into its own invoice without having to go through the process of creating an invoice. Something to speed up processes.