This is a great idea; we currently send out a 'Friendly Overdue Reminder' to overdue invoices individually & paste in a script 'The attached invoice is overdue etc etc"; we have hundreds of these and it takes debt collectors a long time to do this.
If there was a 'tick box' option or something so we could select overdue invoices en-mass and email them with a email template saved in MYOB (similar to how the statements & remittances are sent) that would be a HUGE timesaver.