Pro Sites coupon applied to all months

I'm curious if there is an update on an option for coupon codes to apply to the lifetime of a subscription in Pro Sites. It would be great to have the option to set the coupon code as only applying to the first month of the lifetime of the subscription. I see this has also been suggested in this discussion: https://premium.wpmudev.org/forums/topic/coupon-code-that-lowers-monthly-membership-fee