I just made a browser-based writing program that lets you write without editing. Every time you hit return, it formats the paragraph you just wrote. You can’t go back and edit that paragraph. Editing is for people who have completed stories.
Download it here: .zip or .tar.gz or github.com.
To run it, open the “pretty.html” file with your browser.
You can also try it here.
Update: Now it saves your story locally, so when you refresh the page it’s still there.