Stearing problems using the WASD keys
This is caused by a buggy version of Unity. It should affect all games using this version.
Go into the game properties and add…
XMODIFIERS='' %command%
To the launch options. Those are 2 apostrophes with no space after the =, not a single quotation.
Problem Loading DX Version (Linux Steam Version)
This may be a problem with your linux graphics drivers.
I fixed my problem by editing the game.xml file in the steam/steamapps/common/Farming Simulator 19 folder and changing the <renderer>D3D_XX</renderer> line to a version less than is listed. So D3D_11 would be D3D_10, etc.