Okay, then I am having a strange issue, that I assumed was being caused by not using a steam controller.
When I edit my configuration, it will not save. In fact, I created a config (that was identical to the CaptainKeeb config), and Big Picture mode just wouldn't save it. It would just hang on the screen with a "Waiting..." symbol, and never finish. I have to restart Big Picture when it happens.
So, then I went into the community section and tried to download a community config, just to see what would happen, and well, nothing happened. I would select one (There's one called Xbox 360 config that I've tried numerous times), and it just brings me back to the Desktop Configuration screen and nothing has changed.
I asked about this in the Steam_Link reddit, and the only responses I got made it seem like it was because I wasn't using a Steam Controller, but obviously that's false, and I'm having a different issue.