I planned to released an additional tool to add new content into games, but that is postponed, as I have decided to change some major things in a platform. Once these changes are finished, I will continue working on it. Currently, the only way someone else can add content to the game is to create animations with the tool, send them to me and if they are ok, I will add them personally. Some people already done this several times.
It's not a bug. The main quest is not completely in the game yet and once you finish main quest progress, the journal is empty. Most of the side-quest has been moved to a personal windows of game characters (accessible through diary).