When invoicing a project it would be a huge help to be able to flag some entries as to be billed at $0 and hidden on the invoice. This would save time vs having to go through all time entries and mark them as invoiced when this could have been addressed during invoicing by simply hiding the time entry on the invoice. Furthermore if the status of invoiced time entries could include the invoice number the entry was invoiced on similar to 'Invoiced on XXXX' instead of just 'Invoiced' it would help as well.