Hi!
I just started to use EFS 2.0. and recompiled my game to use it. Now my game is in only 1 file. And savegame file it's built-in also. Now this works also with NO$GBA, working perfect (well, not save), mp3 music too. If you find any bug (it's first time i use EFS) please report to me. The only thing is now load files takes a little more time.