Ability to email customer past due balances

TimeSlips has the functionality of emailing customers statements, invoices, and payment receipts. Is there a way that developers can add a means of emailing select clients their open AR balances (i.e.via mail merge)? I have in the past dealt with a macro that utilized an Outlook template and Excel data to prompt for emailing customers but I didn't write the code (because I'm an accountant not a coder)