iStore - Assigning Receipt Methods at Order Booking from iStore

Understanding that a customer account must have a primary receipt method assigned to process credit cards, but other receipt methods can be assigned,  is there an out of the box capability to set rules that are applied at time of order booking that auto select an alternate receipt method?   Our solution requires multiple receipt methods per customer account.  If this is possible how is it set up and what are the criteria?   Right now we are looking at this as a probable customization. -- Thanks