!Please ALLOW us to settup Controller inputs as Mouse & Keyboard's Keys PLEASE!

There are devices that take the input from a mouse and keyboard and translate them into the same input that the console would see from a controller.

They are unauthorized hardware, and using them is prohibited. Even - as far as I know - for games that allow mouse and keyboard.

This might be game dependent.

I have a Xbox One controller connected to my PC, and I can seamlessly change from keyboard and mouse to controller and back in Sea of Thieves and Destiny 2 for example.

When I wiggle the mouse in Sea of Thieves or Destiny 2, the game immediately switches the interaction prompts from controller buttons being displayed to actual keyboard keys, and if I move the controller, the game switches from "Press (keyboard key) F" to
"Press (Xbox Button X)" for example.

So it might be the game itself not allowing you to switch to mouse seamlessly. Are you able to go to the game settings and force the game to use your preferred input method?

If you have a USB keyboard/mouse, you could try plugging that into the port on the console and maybe you'll get lucky and it will allow you use that as one input and your controller as a second input.

Note: I've never tried this and can't guarantee that it will work. It was just a thought as I think I remember reading somewhere that Xbox added keyboard and mouse support.

The Xbox can't be controlled by keyboard and mouse through the Stream mode at all. While it's possible in the Minecraft Bedrock Edition to use Keyboard and mouse, all other games don't accept keyboard and mouse input at all.

You might have to try Minecraft, if you can control it via Keyboard and mouse while streaming to your PC.

When you change the aiming setting to "mouse", the game still allows you to move with the controller, but aiming is disabled because the system expects you to use a mouse for that function.

This doesn't mean you can effectively play with mixed inputs (controller for movement and mouse for aiming). It's just how the game handles connected devices. As I mentioned before, you can only play with a full mouse and keyboard, or with a controller.