Save post, you mean bookmarking a thread? You can do as alternative the notification function of the forum by clicking the notify function/link in the upper right of the thread so you will be notified on your email on every reply on that specific thread or,
Yes, it is kind of bookmarking, on the forum but I no Need to have a notification for every reply.
just use the bookmark function of the browser you're using, I'm sure it has a bookmark feature.
oh yes It is a good alternative idea but not a forum feature.