Coupon for Firs payment, All payment or... Nr payment you want!

Hi Dear,
I think it could be useful to have the possibility to choose for how many payments coupon / discount should work.
For example: I would like to have a monthly payment 50% off for 1 whole year, and this is not possible for now.

I know it could be setted via Trial Period and Price, but it would be also useful to have the possibility to use this as an offer for the customer.

Very thanks

Hello

Coupon can be applied to first of all payments. However, it's not possible to apply to N number of payments, most payment gateways (if not says all) could not handle it

Tuan