Hey I hope you don't mind if I copy this directly from my reddit post, I realised this might be a better place to post suggestions. Due to character limit I'm going to separate this into two sections: Custom games and Matchmaking. These are ideas for retroactive changes that could be made to the games within MCC. This suggestion is for the entirety of MCC.
Ok so, one problem I’ve found with the games is that their customisability is not consistent. Depending on which game, they have different options available and it can make it annoying, especially if you want to create the same custom game for each game, but don’t have the appropriate options in one of them. I think custom game options should be retroactively added to each game, to improve their customisability. Here’s four examples:
Example 1: Player primary and secondary weapons
Some games have problems with this. Most of the games allow you to individually change a player’s primary and secondary weapon on spawn. However, Halo: CE does not. This is annoying as for example, I cannot create a SWAT-type gamemode with magnums and shotguns, nor can I create one with randomised weapons because that’s not an option. It would be nice to retroactively add an ability to modify a player’s primary and secondary weapons on spawn for Halo: CE. I am aware that different maps start you with different weapons, but that could be rectified by adding a ‘Map Default’ weapon option.
Also, it would be nice to add some missing weapons to games that don’t have them. For example, halo 2 is missing the fuel rod and sentinel beams (I am aware they weren’t in multiplayer, but it’d be nice to add them to custom games), and halo 3 is missing some weapons like the carbine. Also, while Halo 4 does have a random weapons option, it is located somewhere else which is rather confusing. As a final note for this example, while I doubt it would happen, it’d be nice to have a submenu where you can customise which random weapons a player can spawn with if assigned the ‘random option’. For example, if you wanted a player to spawn with random power weapons only, and not have the chance of getting like a plasma pistol or assault rifle. I’ll mention something like this in the fourth example
Example 2: Infinite/Regenerating grenades.
Ok, so apparently Halo: CE had infinite grenade options. Some games like Halo 3 had regenerating grenade options. Some, like Reach, had neither. It would be neat to retroactively add both options to all games. Basically have an option that says ‘Infinite grenades’, which has options ‘No’, ‘Yes’, and ‘Regenerating’. Underneath could be a submenu that allows you to choose which grenades regenerate/are infinite (halo 4 could have an option to only have your selected loadout grenades regenerate). It would be also neat to add an infinity symbol for when you have infinite grenades.
Example 3: Bottomless clip
This is a short one, but essentially while I believe all games have infinite ammo options (if they don’t, it should be retroactively added), not all of them have bottomless clip options (i.e. no need to reload). It would be neat to have this added to all games, particularly halo 3, as they could prove useful for custom games. Also would be nice to add an infinity icon that replaces the ammo reserve number to the games that don’t already have it, to indicate that infinite ammo is turned on.
Example 4: More customisable weapon and vehicle spawns.
This suggestion isn’t actually present in any of the existing games, but I think it would be nice to add. Right now, when selecting what vehicles and weapons spawn in the map, you only get limited categories like ‘transport only’ or ‘snipers only’. These could still remain if you don't need to be more complex, but it would be nice to have a custom option, with a submenu that allows you to individually select whether each weapon/vehicle can spawn or not. For example, if you wanted to specifically turn the banshee off but allow falcons to spawn still. This would also be a good way to allow players to add the fuel rod cannon and sentinel beams to halo 2. This would also be useful for halo 3 and 4’s grenades as both games have more than two. And as mentioned in example 1, this could also be used for when you have players spawn with random weapons.