Hi!
(Firstable sorry for my bad english)
I give my GC results (beta13) mode GC Internal
Cmios v4 Wiigator
-Mode video : Disk
All games who boot in PAL 50 Hz give black screen (no video signal). (but the game is running, if at the begining of the game you can select the PAL 60 Hz mode and you select it, it works) NTSC games works.
-Mode video : PAL480i (PAL 60 Hz)
No problems with PAL games who support 60 Hz, but games who doesn't support it like Luigi's Mansion give a "No signal". NTSC games give a green screen.
-Mode video : PAL (auto)
All PAL games work in beta 12, but in beta 13 it give black screen when you want to change the video mode in games like Mario Kart DD!!. NTSC games give a green screen.
-Mode video : NTSC 480i
NTSC games works. I didn't try with PAL games.
-Mode video : PAL/NTSC 480p
Don't works. But I know it's difficult.
Now the backup compatibility :
-Zelda Wind Waker (PAL): works, but freezes when you want to watch fully the donjon map
-Zelda Twillight Princess (GC) (PAL): works
-Zelda Collectors Edition (PAL) : gives black screen after select a game/video
-Zelda Ocarina Of Time/Master Quest (PAL) : gives black screen after select a game. I didn't try videos
-Super Mario Sunshine (PAL) : works
-Mario Smash Football (PAL) : works
-Mario Kart Double Dash (PAL) : works
-Super Smash Bros Melee (PAL) : works
-F-Zero GX (PAL) : works
-Star Fox Assault (PAL) : works
-Pikmin (USA-NTSC) : works
-Battle Stadium DON (JAP-NTSC) : works
-Soul Calibur II (PAL) :works
-Mario Party 7 (PAL) : works
-Metroid Prime 2 (PAL) works
-Naruto 4 (JAP-NTSC) : works but there is no music (BGM), maybe it's easy to fix?
And that's all