We should be able to put specific weapons into load outs just like arcade mode we should be able to give the leader a custom load out on guardian what the leader says and the weapons he spawns with. There should also be a way to drag and drop circles on a screen before the match where weapons spawn.
Closest thing we have is the fully loaded modes at the bottom of the custom mode list.
In these, you get to pick your loadout between the lobby and respawn, but this only applies to you. I really wish they gave us the ability to customize loadouts for whole lobbies