Hello,
because the game is a beta here is a plugin for this beta.
Open the extractor, open the game wizard and select with ... your rfactor 2 executable.
Choose the rfactor plugin and add the game to the game listbox.
Now you must copy the atached plugin file to your rfactor 2 plugin folder.
Thats all.
There are reports that the motion will begin 5s after the race has started. This might be changed in Rfactor2 release version.