meshflesh

How. I set up a global joypad exit for exiting emulators.(select+START). altought it works on most emulators ive tried. On Mame..the Global exit keys have no effect. And on the dolphin emulator....I have to confirm exit with my mouse. And on snes9x the global exit works..but when i restart the emulator it is no longer full screen and the options show at the top. thank you for this amazing software. any advice? Im running Bigbox mode BTW