I like the credit system now. Just make it so you're more rewarded on performance, but you're still rewarded on game completion so you can't get a bunch of kills, quit and still get money.
Make it so you spawn inside a base thing like every time, but it's in a soft kill zone. It's like a garage with a one way door. So, because it's in a soft kill zone, this would stop AFKers since they would continuously die. Maybe make it so if they die that way, say 5 times, they get kicked from the game. So if they keep doing it, they would eventually get banned from quitting too much, and for AFKing.
Also make it so if you die in a couple seconds of leaving the base about 5+ times, you get a power bonus. This would give the team that lost map control, a chance to take it back.
I would like a space battle playlist, like the ones in StarWars Battlefront 2. I'm not sure if you played it, but it's like this:
Each faction has a super carrier (This could be like a frigate and corvette), and a hangar that spawns vehicles in it. You can destroy main parts of the carriers to destroy them. I don't think the UNSC Frigates have shields right? So they could have stronger plating, that would act as shields, while the Covenant have shields (We'll be fighting someone else, I'm using them as an example). You could also land in the enemy ship and destroy the systems that power it from the inside. The Insides of the ships would be much bigger than they were in Battlefront. You could also use a Jet-Pack outside of the ship, so you could fly around without getting in a vehicle. Everyone would need to wear closed armor (Whoever we'll be fighting will have it so there armor is automatically closed off). There's more, but I don't feel like explaining it all.
I agree with more ways to customize armor. Make it so you can customize each piece of armor as well, or most pieces. Some people would probably make a rainbow spartan, but we can just make fun of them for that. Also make it so with bigger pieces of armor, you can color sections of it. Such as Jorge's chest piece. Make it so there would be a primary and secondary color for it to color the guard thing. Same with some shoulders, as some have both the primary and secondary color on them (Grenadier Shoulder).
Also make it so the Elite equivalents either have customizable armor, or much more presets.