Ability to give X amount off the second payment for coupons

Rather than the only options being X amount off the first payment or every payment, are there plans to add X amount off just the second payment or second and third payments?

All of our monthly pricing options include a 30-day free trial and then a monthly subscription. If we want to do, let's say, 50% off the first paid month, we cannot do that right now. Since the "first month" is technically $0 since we set our forms to have 30-days free, the coupon doesn't work for the second payment (which would be the first paid month). Better yet, it would be nice to specify a range of time. For example, X amount off the first 2 months or 3 months. Only having the first payment or all payments as an option is very limiting.