4th side button

[Nikademis Von Hisson]

I don't know if it is possible to do without a hack but, is it possible to add a forth button to selection screen? We were able to add the 3rd button to YR so you could play as 1 of 3 sides, so what about 4th side? I am posting this here because I don't know if this is possible or would be needed to be requested as a feature. Please let me know if possible and if I need to post feature. Thanks