Split Screen for Custom Games?

My partner and I have always loved playing split screen together and shooting each others faces, but since Halo 5 came out we can’t do this. I understand why they haven’t included it in online matchmaking but wouldn’t it be possible to have it in custom games?
This way we could still have fun shooting each other every now and again and people who don’t have internet would be able to play with their friends still. Taking split screen out of the Halo series has destroyed Halo nights with friends as we aren’t rich enough to afford an xbox one for each person! :frowning: $$$

Please use this thread to discuss this topic, thanks.