I guess this is not an addon, more than an inserted animation from the video
And I think such addons won't help you that much if the "movement arrows" do not get adjusted by you point of view / camera angle.
We use this picture for drawing (just print it out
):
http://lifeingroup5.com/wp-content/u...-Diagrams1.jpg
(Source: lifeingroup5.com )
You just have to keep in mind that you have to draw the signs from that point of view / position where you start to draw it.
The only reason to fail drawing is because you change the camera angle and still move to the direction the small ingame animation shows altough you turned your PoV by 180° or something else.
Nevertheless, if coords work in the room, shouldn't it be that difficult to write a little addon/macro (maybe with TomTom) to build a route?