Is it possible to get to the G6 Lite menu without having to physically restart the DS? Is there a combination of buttons that will reset it so you can select another game without restarting with the DS power button?
You need to press L + R + A + B + X + Y at the same time to return to the main menu, make sure you checked Software Reset when you put your roms on your cart from the G6 U-Disk manager