P11d - Car Availability 'to' date - Pop Up / Message request

First year of using Staffology, therefore new to Staffology P11d Form. Would be useful if Staffology had a pop up / message when clicking in the 'to' field for the car availability date. Populating the 'to' field on the assumption to use the tax year end date, is incorrect and causes the HMRC to change tax codes believing the vehicle to be no longer in use - but should in fact be left blank. Also, once a P11d is submitted, users cannot edit / submit another report and figures have to be corrected directly in the HMRC portal / gateway.