Suggestion: Barrel blocked indicator
Add a barrel blocked indicator.
Why add it? In other games, bullets come out of your eyes which means no issues for peeking cover, while in Squad it obviously comes from the gun. In real life, you would have better awareness and depth perception than the flat image displayed on your monitor. To bridge this gap, many realism games add a barrel blocked indicator to bridge the gap between reality and game.
What it should do? A small warning at the bottom of the screen should appear if the game detects that the distance between the end of your gun's barrel and a wall is less than an arbitrary constant (let's use 10cm for now).
How does this improve gameplay? This avoids the hokey pokey of learning, crouching and shooting to attempt to shoot through those holes in walls to engage someone to only hit the wall in front of you. It's a silly guessing game that in some way should be made less so.
Who would find it useful? Anyone. New players especially, if told what it is in some kind of UI diagram or tooltip would find value in it.