While this might be a neat feature, I would strongly suggest that you don't actually write in the editor on-line. I imagine that if you're interested in word count, you're not writing 200-250 words on a page (though maybe). If you're putting the kind of effort in that takes more than 300 words, you are risking losing what you're typing. Sometimes it's the site, sometimes it's the internet, sometimes it's your browser, or any number of other variables: it is relatively easy for the page you spend half an hour plus typing to get lost in cyberspace. I'd suggest, even if only a few hundred words, that you type, even one page at a time, in an offline editor, then copy and paste into the web page.