I really wish the custom games had more options like in Halo 3. I liked making weird games like King of the Hog (like kind of the hill but the hill was a warthog that was indestructible), or the Juggernaut variant "Golden Armor" where only one Pistol was in the game, anyone that grabs it becomes the Juggernaut, with "gold" armor and every one had to take him down and fight over the pistol.
So far, custom game options are limited, which sucks.
En_Sabah_Nur's comments