Amazing, thanks for your help! Unfortunately after reading all the comments I don't feel any smarter. It's definitely a widespread problem and it seems like one person commented that he was able to use a controller because the developer "Feral Interactive" provided him with a plist file and asked him to add it to the game folder. Now that makes me wonder if something similar would be possible for 7DTD. I believe the problem here really lies with Steam but just maybe there's a workaround that the developers can help with. Keeping my hopes up, thanks for your Help @Jugginator