I would like the ability to set up an automatic nag/reminder email feature for overdue invoices. It would also be useful to have it as an option per client (some clients I wouldn't want to nag if they were late on one invoice but some clients are repeatedly late and I would like a reminder to be sent to them).

I know you could change the invoice template to show 'overdue' and resend to them but it would be nice for it just to automatically send an email stating invoice XXXX was due on XX/XX/XXXX etc etc.