Community Manager for Focus Home Interactive.
Thanks for raising this, I've passed it along to the team. We'll get this investigated.
Edit: I've heard back now - the controls do appear as unknown, but you should still be able to use these keys to do what you want them to.
If they don't work at all, could you let me know?
At this time, we don't have any further plans to introduce mods to the console versions of Spintires: MudRunner, as our current focus is on introducing workshop map support to the PC version of the game, and working on additional content (maps and vehicles) for both the PC and console versions.