I would add drafts to the list of front end features. I don't want to keep separate files on my computer, just to add ideas for a post. My posts would improve greatly, if I could slowly grow them with bursts of inspiration and watching them change in the preview.

I'm aware, that I could keep a textfile and copy paste it into the reply window, whenever I want to check how it looks, but this is just too much work. That's not how my inspiration works. If I have an idea, I have to get it out quickly.