The only thing ED should do is to provide a way for the TARS team to detect when a user is in a vehicle, and what frequency the user has set. And frequency isn't even mandatory, it can be set with TARS. So if TARS can detect when a user is in a vehicle, they can add it.
Don't waste resources on built in voice comms. Teamspeak and Ventrilo has been polished and refined for 10 years. No way that ED can quick fix a solution that out performs TS3/Vent.
And btw, I'm quite confident that TARS's already exists for CA. ExcessiveHeadspace is a tester IIRC.
Edit: btw, IVC for Falcon is a proof that game developers shouldn't develop VC software. When it works it's quite good. But there's a high probability for a FUBAR moment.