DaoistOCReader I already use this. The inconvenience here is that you have to add each chapter to your reading list. It works but it's not exactly an elegant solution as opposed to having TTS built-in.
Also, I'm not exactly sure about this, but I think most authors and Qidian wouldn't be happy about epubs being distributed because it takes away from their potential revenue. Thats's why this feature would be really great since it'll prevent some people from downloading epubs just for TTS using their book readers.
@Qidian promised TTS before the year ends (assuming the sources from above are real), so I'm still hopeful regarding this.