Hello there, there are many features like this who are kind of... not used again anymore because i did not wanted to spend even more time with the game. It was 4 years at that point and please understand that i can not just rest on one game all the time. I wanted to make something new.
But.. there is actually a way for you to "reuse" it. YOu can use the built in story modder if you like. There should also be an tutorial in the Zip file for this.