Forge world/planet - you need to have the option to select any part of this huge forge planet, you'll be able to change the radius of your selected area which will affect the object limitability.( so you can have a small selection area but with a massive object limit.)
Fore option - you get the option to allow an object to be destructible/breakable, if this option is on, you would get a slider bar for the durability of the object.
Forge space - a massive space area, where you can create space battles.( so you have the options of space vehicles)
Fore map editing - similar to far cry 3 map editing but a lot smoother and no texture stretch marks.
Vehicles - all the vehicles that were in every halo game would be in halo 5 including new ones
Emblem - The emblem customization in Black ops 2 is a great spec, I think Halo 5 should have a spec similar to that.
Weapons - Work bench, you create everything for your weapon including skin (texture file upload), muzzle, trigger, scope, handle, and ammo use.
These are my ideas, be free to post any replies on what you think of them.
