With the increasing number of 360 Video camera options on the market, GoPro Fusion shipping this December I think it would be great if Plex included the ability to create a 360 Video Library for 360 Video files, the ability to play them back on all plex app platforms, and the ability to control the camera angle.
Camera angle control support could be done in several ways, game controller on XBOX and Play Station. Remote control for Fire TV Roku. Another great option for camera control would be to add a touch control pad to the Plex mobile app. Make it a remote control for Plex players on the network and include a touch area where you can swipe your finger around in a box to pan and tilt the camera angle.
I think this would be a great add to the platform.