-NPC AI see narrower player hitbox:
You cant even see them and they pre-fire. Not only they see your large hitbox way before your camera can even see them. But they also already know the move you are doing behind the wall. adding a reaction time to the last position they saw you would be the best bet.

-NPC AI vision reduced in storm:
Because the have extra alien vision and can see where no one can!

-Fuel pump gun easier to pull and at least combine 2 pumps(4 guns) to the same fuel container.
For the moment its just painful and borderline useless.

-When entering survivor, you get a couple free items in the heli crash.
There should at least be a 30min+ timer bound to current game that: if you log back to heli crash, you wont get the items to spawn.

-Big POIs(point of intrest) should not be able to spawn to close to each other. Even if it create really cool places some time. For performance and better vehicle gameplay it would be a wise choice. (I think bridge and gas station are hard for performance)

-Food/thirst comsumption depend on movement. Staying still use barely, walking-normal, running-high.

-Survivor should not be able to 3rd person view in vehicle.. Add to the pain!

-Craftable engine? Add power to the vehicle its attached to.
-Unwelding tool.
-This one might already be on the list: Overall rework of scopes.

-You can fly! If your inventory is full, it drops the item. Pick it again! :D (just drop the item in front instead)
-Frame rate become stupid the farther you go. I did not checked if it was memory leak tho. :/
-All my perks reseted at some point. Cant say when exactly but 5k+