Pues creo que si se puede, os pego lo que he visto en una web, y lo probais:
In-game reset:
Hold L + R + Start + Select during game play in a Nintendo DS game to return to its title screen.
Game Boy Advance in-game reset:
Hold A + B + Start + Select during game play in a Game Boy Advance game to return to its title screen.
Quick Game Boy Advance start:
With both a Game Boy Advance and Nintendo DS game inserted, hold B when turning on the Nintendo DS. It will advance directly to the Game Boy Advance games without the usual warning screens.
Abort Automatic Play mode:
After turning on Automatic Play mode, hold Start when turning on the Nintendo DS to return to the main menu instead of starting the game.
Birthday greeting:
Enter a chat room in PictoChat on the date that you entered as your birthday in the system settings. The message "Happy Birthday! Today is birthday!" will appear.
The starting sound of the DS will also change on your birthday and will be a different type of beep.