Puyo from the gbadev.org forums has actually wrote the code for g6 fatlib! Check out the thread http://forum.gbadev.org/viewtopic.php?t=11...er=asc&start=30 - includes links to doom and scummvm compiled with the new code
For ScummVM DS download this file. Transfer the three .nds files to your G6 using the U-Disk Manager's "Directly Copy" option. Copy the three .ini files to the root of your G6. Then create a folder called ScummVM on your G6 and copy your unzipped Scumm-games into it. Works for me