I think the problem is that there is no distinguishing audio between your footsteps and others'. Usually you'd hear your own footsteps a little muffled since the sound is travelling through your body as well as coming from your foot. There is some destructive interference in the sound waves when you ear picks up both noises simultaneously.
Yeah this is quite an annoying problem. I think its some sort of dynamic lighting issue. When you walk into a dark area or shade the entire brightness of the game will start to lower. Its cool and all but the problem is once you step away from those dark areas the game doesnt readjust the brightness leaving everything pitched black even when staring at the sun.
You can't cook or prep-to-throw a grenade and use the contextual commands (cc) at the same time. Doing so will release the grenade forcing you to throw it wherever you happen to be aiming even when you hold down the triggers.
Additionally, firing a weapon in full auto and using cc will lock your weapon into firing all of its rounds.
I hope you guys realize that all light machine guns are equipped with AP rounds and can down a fully geared opponents in one shot. This along with the inherently high ROF will definitely make the gun unbalanced hence why there is such high recoil.