How can we improve WHMCS?

Some customers have loads of domains and/or services. It would be great if they got invoiced once per month with all the services/domain renewals in that invoice. eg Create invoice on nth October for all services/domains due to expire in November.

Currently to generate a single invoice for all services due in a whole month, you need to manually adjust the due dates of all such services/domains to be the same and make sure that the payment method selected for all these services are same as well.