Another tier! (and more)

I love the "Platform Category" feature. Its how I have my arcade cabinet setup. It beats having to scroll through dozens of individual platforms. I would love to be able to take this further and have a "sub-category" type of feature. This would make it so we could have 3 tier system, like Consoles -> Sega Genesis -> Fighting Games or Arcade -> Golden Era -> Maze . .

Thanks for any consideration. I think this would really take it to the next level