I remember seeing a way to set it so it is not for public view. Set it this way while working on it and then change it to public view.
When you change it to be publicly viewable, it will be listed by its original creation date. In case of forum threads or geeklists that you started more than a few days ago, that means that it will pop up on the bottom of the list on the front page or will not be visible at all.
I type my reviews, lengthy GeekList text and other lengthy text in Word and then copy and paste the bits in when I'm done polishing it up.
This is the best advise on this matter. It's a little bit of extra work, but it has the additional advantage that you don't have to write in such a small text box.