Is there a quick way to add a "subscribe to this forum" button to a particular forum, much like the way "Watch Thread" button works?

I looked at trying to hack it by using the exact same form post as user_profile_email.html template, but that doesn't really work because:

1. it deletes all other forum subscriptions, I need it to add only, not add/delete
2. it can't redirect back to the current forum, there isn't a "you are now subscribed to this forum" template available.

Thanks,

Joe
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