Re: Ability to reply to Closed threads
I think that what you want is possible (I am not sure if the reply system has such a feature, but it can be managed). But remember, if the thread is closed while you are on the page (writing you reply), when you hit the reply button you will get an error (that you don't have enough permissions to write in that topic). And you can't do anything about this (in fact, I think it would be possible, but it would be a difficult task).
Not a teacher.
Not a native speaker.
Just a language lover who is majoring in English.