My guess is since GW has no buttons, you will put the games inside the SD Card and set UP a list with the names of the ROMs and a order for them to appear.
So GW will show the games one ofter another untill you choose to play one.
Or it will be one game per SD card.
Or, Gateway's method has nothing at all to do with Sky3D's.
1. We do not know if Sky3DS is using an actual exploit, or just card emulation.
2. Correlation is not causation.