Dual screen display mode for full SNES screen access
Suggesting this as a feature request.
Hey, I'm wondering if it is possible to implement a display mode where both screens -top and bottom- are used for the viewport. Since currently one of the screens will always go unused while in play mode.
The special "pixel squishing" display mode which shows full screen is good to have, but makes many games harder to play than it needs to be - SNES games were thought and created to be played in front of a big screen TV, and for games like Mario Kart and the DKC series the squishing doen't really keep playability at reasonable levels unless you are playing on a (3)DS XL, I guess. The other modes keep the full resolution at the expense of cropping which, if I recall correctly, is not configurable as a per-game setting, meaning you have to re-configure each time you fire up a new game.
A display mode that uses both screens would provide the best of both worlds plus some extra benefits. It would allow playing at "natural" resolution, without missing any information on screen. If the section of the game screen to be split off is configurable as a per-game setting, best case it would allow for some games that keep only / mostly scores or health bars in the top / bottom part of the screens to have those parts be split off and function as an HUD of sorts.
I'm visualizing this potential feature in my head as a screen mode not unlike "EPIC MODE" for Mario 3 on the NesDS:

I'm not experienced in programming for the DS but I would guess that a cursory implementation of this feature would be about the same complexity to implement as the viewport cropping display modes? Since the only thing that changes is that the part of the screen that was "discarded" is still sent to the system to be drawn.