Almost 50 hours into the game, have some suggestions for things I've noticed.

Text chat as it stands is pretty fiddly, if you backspace too much to delete your message you can accidentally leave the chat. I think a good way to handle it is how Source Engine games handle the chat: pressing the chat button "locks" you into the chat until you exit out, preventing you from accidentally closing it.
PLEASE add voice chat ducking! (and allow boosting the volume above 200%.) Even at max VC volume, hearing any teammates using VC is near impossible, especially when anything even remotely intense happens. VC is by far the best way to divulge information, so to have it bear unhearable is terrible.
Please add snapping to the audio sliders to quarter values (25%, 50%, etc)