The only sort of Solution that i have come across to actually exit the FCEUX Emulator in the current PiPlay Firmware is to go into the Cheat Menu which is the F1 Button on your Keyboard.
Then Press Ctrl Alt Del with these buttons pressed down it exits the Emulator. But when exiting the Emulator it reboots the whole PiPlay.
It may be a temp fix but its all that I can figure out on such short notice without going into configurations.
I hope that this has helped anyone that likes to use the FCEUX Emulator on PiPlay current firmware.