You added a lovely feature to be able to have sound in the background when alt tabbing. By default when you open the game this is set to "game" only.
If you change the feature to "game and sound" and alt tab out, the sound continues which is such an awesome feature.
However when you quit the game through the menu, the next time you open the game again this setting has defaulted back to "game" only.

I checked my _settings.DayZProfile file and looks like the flag being used is pauseMode
pauseMode=1; being game only
pauseMode=2; being game + audio?

Even if this is set to pauseMode=2; the game will always load in game background only and you have to manually change it each time.

Would be great if this parameter which is saved to the config file is used on startup, or alternatively if there is a command line parameter we can pass to have it start in "Game + Audio" everytime.

UPDATE For anyone who finds this
Realised that my Launcher had the param -noPause as a command line, or if you are using DZSA make sure to untick No Pause in the settings menu.
This seems to overwrite or mess up the dayz game settings.

Once I unticked that, the game now launches with Game + Audio every time.