Deposit Invoice Changes Date after Payment

When we set an invoice to deposit invoice and the client pays that deposit, the invoice due date should automcatically change. That or we set two due dates (deposit & final). Right now, we set the due date to whent he deposit is due but if they pay automaically online, we have to mannually go change the due date or it becomes past due.

We would want to set a custom date for the new date; some clients might be event day minus 30 days and some clients might be event day plus 30 days.