1 year free monthly membership, based on coupon code?

Hello, Using s2member Pro with Pro Form - I have a client that wants to give out a coupon code to only a few people - good for 12 months free, then returning to monthly regular billing.
I've been searching and testing, but can't find a way to do it. Is this possible in s2member? If so, how would I set that up?
Thanks for any insight.
Jonathon
*EDIT* Finally found a post that sounds like a work-around that might work.
viewtopic.php?f=4&t=16674&p=59700&hilit=0.01+recurring#p59700
I've been searching and testing, but can't find a way to do it. Is this possible in s2member? If so, how would I set that up?
Thanks for any insight.
Jonathon
*EDIT* Finally found a post that sounds like a work-around that might work.
viewtopic.php?f=4&t=16674&p=59700&hilit=0.01+recurring#p59700