make an option NOT to send email receipts - i.e: events have a benefit subtracted
if a purchase is made for an event - the correct receipt subtracts the benefit of the ticket - there is no option to do this - thus, it would be nice not to send email receipts - send receipts manually
Are you talking about using eReceipts in Mail?
Would inserting the receipt amount field work?
Yes, a receipt amount field would work and is necessary.