Okay, I literally JUST tested this with Luigi's Mansion on the latest dolphin emulator, and it WORKS. I played around for a few minutes out of boredom and figured out how to do it, of course it's only for the Gamecube Controller, but still... 
All you have to do is uninstall joypad and reinstall it using the "magic joy box after Nov-1-2007" installer from the mayflash website. Especially if you bought your joypad after said date.
Start dolphin and pick a game that you want to make analog work for, for setting this up I suggest Luigi's Mansion on the gamecube. (If you don't already have the ISO pm me and I'll see what I can do about that *wink*)
Now before you do anything, make sure you clear the settings completely with the 'clear' button. Then Select the "DInput/0/TigerGame XBOX+PS2+GC Game Controller Adapter" as the controller/input type.
I know this sounds odd, but map the sliders first(leave EVERYTHING else blank, including the left and right shoulder buttons) and get them working by checking it in game, I did mine while running Luigi's Mansion.
Now go to the "threshold" option and set that factor to "80" instead of 90.
[color=#FF4500]IMPORTANT[/color]!: Before continuing make double sure that the left analog is Slider 0 + and the right analog is Slider 1 +
Now map the Left and Right Shoulder buttons to their respective slots.
Afterward map the other stuff the way you normally would. If the C stick acts weird while playing Luigi's Mansion simply map the Up and Down axis on the C stick to the opposite axis. IE: Down for "Up" in game and Up for "Down" in game.
Happy analoging =3
All you have to do is uninstall joypad and reinstall it using the "magic joy box after Nov-1-2007" installer from the mayflash website. Especially if you bought your joypad after said date.
Start dolphin and pick a game that you want to make analog work for, for setting this up I suggest Luigi's Mansion on the gamecube. (If you don't already have the ISO pm me and I'll see what I can do about that *wink*)
Now before you do anything, make sure you clear the settings completely with the 'clear' button. Then Select the "DInput/0/TigerGame XBOX+PS2+GC Game Controller Adapter" as the controller/input type.
I know this sounds odd, but map the sliders first(leave EVERYTHING else blank, including the left and right shoulder buttons) and get them working by checking it in game, I did mine while running Luigi's Mansion.
Now go to the "threshold" option and set that factor to "80" instead of 90.
[color=#FF4500]IMPORTANT[/color]!: Before continuing make double sure that the left analog is Slider 0 + and the right analog is Slider 1 +
Now map the Left and Right Shoulder buttons to their respective slots.
Afterward map the other stuff the way you normally would. If the C stick acts weird while playing Luigi's Mansion simply map the Up and Down axis on the C stick to the opposite axis. IE: Down for "Up" in game and Up for "Down" in game.
Happy analoging =3