Does anyone remembers that in Halo 4 you were able to save gamemodes easily into your console? Well, I think 343i should improve the saving mechanics for that kind of stuff, specially now that a lot of people is playing Super Fiesta (including me) and wants to keep playing it in custom games with friends after it is gone. If you agree with me leave a comment below so 343i can read it. 
Seconded.
If nothing else I wanna be able to use it for a machinina.