A concrete suggestion from me:
I recently bought the game "Brothers in Arms" and the shootouts are great!
You have no uber-accurate rifle and you are not an elite-sniper that doesn't need to breath.
The fights feel epic because you actually have some decent firefights because you really have no OneShot - OneHit but the realistic damage persists.
Surpression has an influence on your weapon sway and the size of your fire cone and you can actually supress effectively with every rifle, not only wit MGs.
It's a pity, that you can't do such a cover system, so I won't suggest it
I have no clue how less accuracy would affect the overall gameplay and the firefights but I like to see longer battles and not just so 1 Secondactions like: enemy-boom-dead
I hope you get what I tried to suggest
Regards TheRevoluzer