Invoice date manipulation on monthly recurring services - invoice one-time products immediately

[pKris]

Hey there fellow WHMCS-ers!

 

We sell both software and hardware, we'd like the ability when ordering through the administration panel, to invoice one-time services immediately but prorate monthly service to a particular date (with internet installation it's always days out for us to get service installed, and monthly service are billed at the end of the month - we've accomplished this by simply sending all invoices 30 days prior to their due date, as WHMCS can't currently do post-paid services.).

 

Essentially, I'd like to choose to invoice one-time costs immediately, as select custom due-dates for all other monthly recurring services in the current order.