Thanks for your hard work, DS is not very powerful system, so amazing to see so many good emulators for it.
I'm using NitroGrafx 0.7 on a DStwo flashcart and 3DS console. I have put the NitroGrafx.nds file in my \ds_plugin\ folder.
Before copying them to the SD card, I open all TurboGrafx ROMs...