We just tested the app on TS 3.0.10 and DCS 1.2.3 and found the following:
Communication between A-10C and KA-50 seems to work. And that's about it.
P-51 and ground commanders (inside vehicles) have not been able to communicate through TARS.
The plugin keeps muting clients who leaves the game and disconnects from TS, so you have to unmute them manually the next time they connect.
But it's nice to have a realistic way of talking within a package when you are flying without human ground commanders etc :)