Invoicing for billable items sets an immediate due date

[KacperPol]

We frequently add time entries to the "Billable Items" tab on client profiles. They are, by default, set to "Don't invoice for now".

Periodically, we come in and create our monthly invoices. We select all the billable items, and click on "Invoice Selected Items".

This creates an invoice that is due immediately, and does not respect due dates that we set (i.e. it doesn't set the due date 14 days in the future), and it also sends the client an email, so we can't even modify it before it's sent out.

We would like it so that the billable items, by default, would be generated with a future due date (e.g. our default, 14 days). Is that possible to do?

The only thing I can see is the settings on individual billing items; invoice for a specific date. However, that would require manually editing every singe billable item (which is hundreds per month).

Any help would be hugely appreciated.