Steering Wheel Button Mapping Support

This function does already exist.  If you look in the Xbox Accessories app for mapping a controller, there are options to enable a "Shift" function and assign it to a button to allow multiple combinations of buttons to trigger different actions. 

As far as specific in game assignment, that would have to be implemented by the developer.  Have you attempted to use the Xbox Accessories app to assign buttons, and then map them in game?

What wheel is it?  The manufacturer might have their own software to map the buttons?

I just reviewed the Xbox Accessories app and realize that it only does official controllers or via the Xbox Adaptive Controller for the app to do what it does.  Because of that, I would recommend you take a look at if there is any software from the manufacturer that you can use to map and configure, and possibly update on the firmware to do what you want it to do?

What wheel is it?  The manufacturer might have their own software to map the buttons?

I just reviewed the Xbox Accessories app and realize that it only does official controllers or via the Xbox Adaptive Controller for the app to do what it does.  Because of that, I would recommend you take a look at if there is any software from the manufacturer that you can use to map and configure, and possibly update on the firmware to do what you want it to do?

Can we approach this from the other side? Can you identify any wheel or any software which will map steering wheel buttons beyond those found on an XBOX controller?

I've also been frustrated by the fact that I can't access any additional functionality from the extra buttons on my Thrustmaster TX 458 Italia, and I've read the same thing about Logitech wheels. So if users from all three main sim wheel manufacturers are struggling with this, rather than compiling a list of all of the wheels we own where we haven't found a way to do it, can you provide some direction for how we can?

I'm guessing since there has been no update to this since the end of July there is still no way forward with this? I've owned Xbox's since the first one and been a fan of sim racing for long before that but this is a major limitation and is really making me consider switching to PlayStation for the next generation consoles. I appreciate that Thrustmaster have announced that their existing products will be compatible with the new Xbox as I own the TX base. I'm considering upgrading to the F1 wheel but there is absolutely no point if I'm stuck with the same number of button assignments. 

I get the Xbox one is now essentially going to be sidelined and therefore an update to fix this self-imposed limitation is unlikely however I'd really like an answer regarding the Series X and how 3rd party controllers will behave as it will directly affect my future purchasing decision. Frankly, the ongoing silence indicates this situation will continue, and Microsoft don't want to admit to it before suckers customers have paid their money.