CARS:
The common cars that are all over the map maybe if you shoot it enough time it will explode.
WEAPONS:
Have sticky grenades.
Have a targeting laser for the RPG
have a type of laser that you can blind enemies snipers if they are aim down thee sight.
CAMOS:
With the camos maybe use illustrator so the camos on gun don't look pixelated and it will maybe more easier to use it and to put on new weapons.
PLACEABLES:
Camo bags it will be like a sand bag but you can shoot thought it every time you shoot thought it it will take damage it will be weaker as well.
Ladder the you can put down your self.
CLASSES PLACEALBES:
With the engineer/sniper class that has placeable ladders that you choose to swap with grappling hook and you can have one in you inventory but if you have it you will be more slower.
Have a new placeable barricades for doors and windows.
have loadout that you can pick form 5 and you have to level up to get them and if you level up to 200 it will reset if you reset.
SNIPER AMMO:
with the sniper class have it so you can pick what ammo to use so like if you have armor piercing it will pass through enemies and armor an it can go though barricades but it will lose the velocity of the shoot as will as the people it go thought, but the weakness will be it will do less damage maybe half the original damage.
with explosive ammo it will do more damage but it will stop at armor and have less range/velocity.
and you have the long range ammo you can shoot a lot further but the blast will be heard and you can't use the suppressor it will do a little less damage.
RAMDOM IDEAS:
Maybe have placeable traps that you need to use a shovel