Game controlls and Player feedback
I think it would be nice to add the option to switch between toggle and hold in settings for various things like croutching aiming sprinting etc...,
I also think it would be nice to have some kind of player feedback when hitting and or killing an enemy however I do understand the game is supposed to be stealthy and realistic in some ways, and that this might go in against what you guys as game developers have in mind for your game, but I do believe there are some ways you could still provide feedback like sounds coming from the enemy when they got hit (for example look at insurgency), or clearer more visable blood,
these are just some ideas I'm sure you guys can come up with something you might like and fits your intended gameplay. For the rest i really love your guys game keep up the good work ;)