it works perfect when windowed mode with mouse cursor is outside -> VR gameplay screen
(by pressing ALT + TAB). it has potential. I think that you can handle this easily!!
I am not the first one who want this.

https://www.reddit.com/r/Vive/comments/4f2l44/steam_link_for_spectator_screen/

https://www.reddit.com/r/Vive/comments/49rltz/steam_link_and_controller_for_operating_steam_and/

https://www.reddit.com/r/Vive/comments/4daxuz/steam_link_for_spectator_screen/

http://steamcommunity.com/app/353380/discussions/1/361787186427318729/


If you hear me, please update this on next beta build !!!!

Thanks!!