Most other forums I am on do not prune subcribed forums from the control panel... I find this to be a great way to keep track of the threads I've replied to. I suggest removing the auto-prune after 5 days of no posting.
I would agree. That is why my subscription to the pinned Fishless Cycling thead keeps getting dropped. I don't think it was like that a while back. I will bring it up in the Mods Forum.