is there anyway at all to have a full screen 16:9 snes game,without having to go into a emulator first aka a shortcut cia for the game
Unless some hack is found this is not possible.
I'm not sure for SNES, but it's pretty easy for NES, GB and GBC.
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Hopefully when @Asdolo releases his Ultimate SNES VC Injector for 3DS it may fix this issue. Or probably when this tool will be updated soon.
Sound support is hard coded into the emulator - it's beyond the scope of what an injector can do.