Most standard android apps are meant to be used on a touch screen device. To utilize these apps on a Shield TV you really need to invest in a blue tooth keyboard and/or mouse.
New to the Android phones. I have a Nexus 7 tablet. On the tablet I am able to set up individual user profiles for log in, apps, home screen setup etc. Can this be done on the S5 or Android phones in general or is this just a tablet thing?