Hi
When it comes to google play,please clear data!
When it comes to gamepad,you can use micro USB cable to wire it up and use it as a wired gamepad.
Status bar not being able to turn on,we are trying to find a way around in it.All feature are accessible through the keyboard shortcuts.
Games can be played through emulators lile PPSSPP(PSP emulator)and game itself can be located on external HDD,and only emulator app data on actual internal memory.
When it comes to android games,weather all gamepads will be compatible or not,that actually depends on the game developer itself.
If you need more info,please feel free to reply!
Regards