I would like to see a way to point out things. AI crew should point out targets and areas of interest. Perhaps some kind of marker should appear on your display. In the Mi-8, for example, the two crew do nothing. You could also use this to simulate friendly radio coms when flying with other AI units.
In multiplayer, voice coms are not always available. Being able to broadcast and highlight targets would really help.
In multicrew, it would simulate pointing or other body language.