On a hunch, I decided to fill the dead-time in between start and contact with some ambient "tacticool" music (basically some low-key downtempo stuff from the 90's idea of "tactical") and realized how much more I enjoyed the game when the background wasnt just Lamang's admittedly half-decent jungle soundscape.
Try it. I encourage you to put up a 60-120sec "Fortunate Son"-like music of one of several during LZ insert/extract. That alone adds quite a bit to the atmosphere of the game. And filling in the travel time between me and a Point of Interest with some music really does add to the game for me.
Granted, I dont know how you'd want to do the ambient music when, say, a hostile is near, but thats more up to developer discretion if anything. Also most importantly: a mute button for the music if you do intend to add any more. Some REALLY want nothing but actual game sound to avoid being soundblinded by a sneaking pvper.