This has been something that I've experienced and others too:
Anything can go wrong with writing a post. The forums can suddenly be down, or when you click 'post' you get a message saying someone replied and the message seems to have vanished, or you accidentaly click the tab away of your long post.
It can be very frustrating when that happens.
Of course there are ways you can individually do to prevent this happening from much as possible, but how helpful would it be if TFF would be able to temporarily save what you have written so far?
I've been on forums and other websites where when you wrote something and an accident does happen (the table being closed or the computer crashes) you can just open up last tab and it shows what you had written before.
So my suggestion is for the forums to (1) automatically somehow save the post for a short time.
(2) If not automatically, maybe an implemented saved feature option.
Once you click post it will work the same way as any other newly posted reply