I'd like to request sounds for breath holding/resuming. Currently, it can't be determined reliably, whether you actually did hold your breath when holding RMB and for what duration - and this time (and whether you actually can hold breath) vary greatly because of fatigue.

Without sounds (as it is now), it's very hard to do, given only the scope sway as the reference.

Proposed solution: add 2 sounds - for breath hold start (deep inhale) and for stopping holding (exhale). This will increase immersiveness and give more feedback for controls, as well as enhancing long-range sniper shooting.

Good examples of breath hold sounds:
Splinter cell games (scoped weapons)
Sniper: Ghost Warrior series (the game is terrible IMO, but the mechanics are good for this part)