can't we subscribe with forum like in (the ugly) google forum XD in google forum we have 3 ways to subscribe with the forum :
1) subscribe everything posted in the forum , topics,posts,games (if scirra made this) and blogs, tutorails ....
2) subscribe for the posts,topics we made like the scirra using it now but they don't send emails for that just notification in the forum...
3)title of topics only