Even if that sounds neat, I actually dont care that much about moving actors since it will be mainly archviz stuff where you just have a camera moving through the scene or an invisible player character. So I really dont need support for that. That was also the idea behind my question, because in this case, its just not needed 
It would also be very beneficial if the stationary directional light would allow for a variable shadow penumbra, but sadly thats also not supported 