is there a way to have old threads automatically closed if they, for instance, haven't been posted on in 6 months?
If I'm not mistaken, I believe this feature is on 1.6.
I know there's delayed moderation but I don't think it's automatic (in 1.6). However there is a plugin for 1.4 iirc. Search the mods site.
Oh well that makes sense. 'tis a good plugin.