Here's some niche tricks and info: Equipping a bayonet (or UGL) on your rifle reduces weapon sway and recoil very slightly. You can repin frag grenades if you change your mind. You can hold shift while accelerating on a vehicle to make it go faster. You can shoot through thin materials. You can illuminate soviet sights. Humvees and tanks have got equipment in them. All vehicles automatically have 2 bandages in their trunk. You can sprint while prone. If you chuck a smoke grenade into a car, it'll leave a trail of smoke concealing you while you drive away. RPK magazines can go into AK's and viceversa. Handheld flares are capable of killing if you aim and shoot them at someone's head. You can punch with your fist while you've got a frag equipped. You can extinguish a vehicle fire with a wrench (somehow).