Custom games ignored?

If 343 tried to replace infection with flood mode then they just made a big mistake unless they update the game so we can edit the flood’s traits and weapon. I know flood had held other weapons in past games. 343 mainly focused on campaign and multiplayer but not custom games. They need to work on custom games, since it’s a big thing that got halo 3 to last longer. They also need to add more gametypes like v.i.p and stuff. i have not heared any news about custom games since before and after the release of halo 4. halo 4 is a good game but it lacks a lot of stuff needed to be a better game.