Uhm...did you try pressing x? On the Keyboard I mean, that switches the places of the screens...I'm amazed by the amount of games that work, thanks again Exophase!
I wanted to share an idea : Could it be possible to make the second screen appear with the push of a button when on "single screen" mode? For Super Mario for example, you just need the touchscreen to choose a mushroom or flower... Or Zelda, for the map... It could be a way to make the most out of the single screen and making the second one appear only when needed without having to go through the options...
Also, great job Exophase!