Like I said before, it is not just for unlocking stuff right from the start and such, but there are actually some cheat codes that modify stages, gameplay or add some other thing to the game to make it more enjoyable.
Besides, what is the point of having cheat codes implemented in Nintendon't then since "(saving) now works, and you don't see the point"?
Don't mean to be harsh or anything, but cheat codes is one of the things I wanted to be added to Gamecube games in some other way that was not DM, and Devo doesn't have that option either.
I get your point, and you're right, the Cheats option is there and can be used for other things (though I've never seen a cheat code that makes the game harder, and thus more enjoyable to me); I was just voicing my opinion when i said I don't see the point in wanting cheats to work (specially because it needs extra stuff to work), but since you have your reasons for wanting it, it's ok.
Even so, I'm not sure the devs would go out of their way to see why cheats aren't working, like they would if there were issues with compatibility or controllers, for example. They might work on it after the "important" stuff is done, but again, that's just what I think.