It is really weird that if someone is subscribed to your list and it is inside an autoresponder, it can be removed from one autoresponder only.
Infact the same user can be subscribed to different lists, but if you want to remove him from a single list only... you can't.
The only option is to remove him from the ENTIRE database.
This limit a lot what you can do with this system.
I suggest to add an option "unsubscribe from this autoresponder only" when you select an user.
Glen, he was talking about doing it all automatically. Through actions. We know you can do it using quickfind like you do in the video.
You can do it in ARP Reach.
I have a video showing how you do it here:
I hope this solves your problem
Glenn Pearson(Spark Blogger)