Posing the questions: What do you want Windows to do (or stop doing) while you’re playing a game? What can Windows do to optimize your gaming experience? What other gaming features would you like to see? Of course, any constructive response regarding Windows and gaming will begin with taking a deep breath.
Putting on our own Windows 10 design hat for a moment, the main thing that we'd love to see is the expansion of the Xbox App with a better optimised and integrated store that takes full advantage of Game Pass and the Play Anywhere features of Windows 10.
There are already a number of great suggestions including optimising the OS to disable processes when in "game mode" to being able to easily stream from your PC to your Xbox One console.
To provide your own ideas and feedback or vote on the existing suggestions - head here