I'd like the option to turn assassinations off just so people will stop complaining about triggering them when they meant to do a beatdown lol
Other than that, I'd like to see some more cosmetics appear in Halo. Maybe more colors for everything. I'd also like to see the return of the black armor, rather than "steel". Oh, and an easier way to make lobbies invite only, or maybe a tutorial for forge and the menu. It'd be nice.