I believe you should be able to sprint shoot and melee at the same time. I you run and swing at the same time it would just be harder. Also if you shoot it would be very inaccurate and if you looked through the sights you aim would waver from side to side to make it highly discouraged.
Also involve leaning and barrel rolls. I like to play a lot of arena. In arena you only have one life per round. So to make sure it’s safe to go ahead I would lean and see if anyone's there. If there is, well i will do a quick barrel roll and get the jump on them.
Maybe there could also be sidearm’s. Sidearm’s can provide a quick swap. I always rind myself caught with my pants down. You are out of ammo and 2 blues come around the corner. Well I have a trusty pistol so I am not screwed. Let’s say you find yourself in close quarter combat with a rifle, pull out my pistol and balm.
Plus when typing in team chat, that should be your teams color. I find that this would be helpful if you are give tactics to your teammates, you don't want the other team to know.
I think there should also be voice chat that can be either team or public. Along w/ team chat you should be able to whisper. Whisper means chat with someone directly and one else can hear it.
Lastly grenades should be ability to blows away blocks w/in a certain radius and injurer ones beyond. Because if a grenade has to be right next to a wall to blow it up
Shotguns have farther range. In real life when shooting Skeet AKA Clay Pigeons they are 30ft away. And here it takes 2 shots if you are 5 blocks away. This would encourage Shotguns because now all I see are smgs and rifles.
Prone. Prone would be nice because if you are sniping it is harder to see you and hit you. This may not be very good because if you go prone you are most likely to get hit in the head. Also prone can encourage camping. For example, when tunneling if there is a coroner someone could go prone when you walk left they are to the right w/ a spade.
Muzzle flash. that would be nice because it would add to counter sniping or at least having so idea of where the sniper is.
But muzzle flash would decrease the chance of being hidden.
Slugs and buckshot. I believe it would be nice if I could choose buckshot or slugs in my shotgun. So if I get bored I could change it up a little. Also with a slug should be semi accurate at a long range so you can snipe w/ it.
Bullet drop. Bullet drop would be nice to add a bit extra realism. For example BF3 has bullet drop when sniping.
Flash bangs. As I said earlier I like to play arena. To make sure it is safe I can throw a flash bang. Also if you are low on health and don’t want to die, throw one around the corner then run in and light the room up.
When health decreases your aim goes off and you move slower. I find it ridiculous that with 2hp I can run forever
Sprint cap. When sprinting I can run 3 marathons nonstop with my weapons and ammo weighing me down. This would make it so it would take longer to get to the battle field though.
Spectating it is wonderful but there are a few things that need to be fixed. When someone is going up stairs, in spectate it can be very choppy. Also, I believe you should be able to switch between first person and back to third when in spectate. I also think that it should automatically scroll through the people who are alive then go to the dead. Lastly when in spectate you should be able to see the HUD of the person you are watching.
Also possibly AOS mobile or and map editor mobile.