Per Product late fee options

Per Product late fee options: Wondering if there are any plans (or could be) for more granularity regarding product late fees. We offer a few different types of services, some are due on a monthly basis while others are due immediately when services are rendered. Currently I can only set a single blanket late fee that I base on our monthly service that is a percentage every week. For other services I would like to be able to apply a daily flat rate late fee. I can't see a way to make different late fee schedules/rates currently.