and it can install korean support on your wii, which is then overwritten if you install cIOScorp...
PS: korean disc support does not break wad installs in the ARC mod05, just checked.
that problem existed when you could install IOS249 for korean discs, also by qleap, and was only a problem with wad managers that used 249 (1.2+), wad manager 1.1 still installs wads fine with that cIOS, as well as with ARC mod05 fully installed.
...but cIOScorp still overwrites it, unless someone wants to fix that in cIOScorp.