Yep, should be possible with small amandements in the code, good thinking. For now the only potential difficulty to overcome could be, if AI would keep targeting visually invisible units, can't recall, if that's the case, I need to do some tests... Also it would be optional and present only in whole map mode (no gain from it in single objective mode).
Can't understand. They removed the sounds when you are prone and look around without mentioning it in the changelogs??
In any case...happened to me Yesterday in solo...someone was on rooftop with P90....I managed to heashot him with my trusty M16... Then I danced