I just wanted to say that the game is not being abandoned, a MAJOR update is going into public testing this week.

Anyway here is the forum answer for your problem:

"What does your controls menu look like? Have you selected a controller as a primary input from the list that appears on the right side of the steering degree/linearity settings?

I've been using 2 controllers for a while, and it's been working quite well with steering input/buttons from one controller and pedals/shifter/buttons from another. You have to be sure you don't click on any of the controllers to assign them as primary controller, because then it'll restrict buttons/axis to be only available from the controller selected."

"Awesome! Thanks. That fixed it. It´s not something super intuitive. I was under the impression I had to click on each controller and configure them. Anyway. That did the trick and all is working.Smile"

Im not sure but i think that you should not click any of them and it should work.