Hello,
I would hope that in addition to keyboard or controller also the option mouse to direct (as in Project Cars).
Is something being planned or is hope that is something like this implemented?
Anyway Forza makes now a lot of fun and I am glad that has found a way to the PC this game 
What do you all mean?
Mouse steering only works when the input is bang on immediate, which means there has to be NO lag between the mouse movement and the visual wheel movement and has to be exact.
Project CARS is not a perfect example since the mouse input in it is not direct, as the wheel has a maximum turning speed no matter how fast you move the mouse.
The only game with proper mouse control that I have experienced is Live For Speed. I don’t know about others, but I am so sensitive to the input lag with mouse control that even at 120 fps I can notice the lag with V-Sync on. Also in LFS the in-game wheel is mapped directly to your mouse movement, so the wheel can turn 1080 degrees in 0.1 second if you want. Not realistic per se, but definitely makes it drivable. Mind you, there are equally as much mouse-driving Schumachers as those with a wheel in LFS.
II would be very happy if mouse is steering implemented into the game. LFS I unfortunately do not know and could not call as an example there. I know only that it is something like that, but I have not tested it halt.
One custom yes only the X axis of the mouse at the keyboard input installing NVIDIA now provides buttons (but need not).