Dr. Wicked's Write or Die is a program available online which allows you to type some of your WIP, and then cut and paste it into your own file. But before you start, you declare your word/time goal. If you stop typing the screen turns red and if you don't start up quickly the computer starts making an unpleasant noise that you won't want to listen to and if you still don't get back to work . . . I don't think you die, but I doubt anyone's risked it. You can purchase a version with additional features for 10 bucks, but you'll want to see if it works for you before considering that.