As nullPointer stated, Xpadder is a great solution but you can gain the same result with the GameEx controller mapping utility (AdvancedConfigEditor.exe). Open this utility. In "Keys to send on Exit", insert the key(s) bsnes uses to quit. Then go to the "Game Pad Exit" tab: Click "Enabled" and map your combo keys. Save the file and name it as you want. The open the ConfigWizard, select "Custom", then Advanced Emulator Setup. Select the system you want to map (in your case it should be SNES (bsnes)). Do you see the line in grey? Advanced Config. Select the file you just saved. This should work. EDIT: fRequEnCy ninja'd me!!!