When beginning a post, the page bounces a bit and hides the Submit Post button. When ready to submit, the user must scroll down and the press the Submit Post button. Since the 'Enter/Return' button is used for a new-line in the body of the post, Litphoria could reverse FList's mode of using Control-Enter for a new-line/line-feed inside the text entry box, and make Control-Enter submit the post.
Otherwise, provide some other short-cut key for submitting the post. This makes it simpler to post period, and then there is no worry about the fact that the Submit Post button always gets scrolled past the bottom of the window, requiring you to scroll up to click it, reducing the bounce down and need to scroll up for each post cycle.