@1Creativeray There is currently no way to connect any input device to the Chromecast; the Stadia controller only works because it connects via WiFi directly to the server which is streaming your game.
So no, I'm afraid you won't be able to use your keyboard and mouse while playing over the Chromecast. That will only work when playing via the Chrome browser or a supported phone.
Please add this.
Stadia wants to give us "one place for all the ways we play" so please offer us the possibility to use all the Input devices we want.
As a pc gamer i love playing with Mouse & Keyboard especially in shooters but also in most Games (strategy, Simulation, rpg...)
This whould imho also be another unique selling point.
Zelenev s Idea Sounds great, If it is possible. Using the USB Port to Connect Mouse and Keyboard directly to the Controller whould be awsome.