Customising invoice creation date before the due date Per customer

[TimT]

Hi,

I am aware of the setting to specify when an invoice is generated by the number of days before a service is due for renewal. This is for everyone globally however and I have 1 client that I need to customise it for.

Is there any way via hook etc or some modification to set a customer to have a different number of days before the due date that their invoices are generated? Im happy to hard code it as its just this 1 customer (sigh)

Thanks
Tim