Yeah that is included with the ModMii package but it does not work for everyone
Had 2 Wii's that this could not be enabled in, not 100% sure why either, but none of the options there could be saved, you can change them but when saving it comes up with an error.
(don't ask me what that was as I don't remember) might of been how it was installed though at the time, there are 2 options if I remember correctly for installing that to start with.