So APB had voice activation like that as someone mentioned. Now, it was somewhat interesting but I dont think it fits in PS. It certainly had downsides, like when I heard the guy acting like a gangster setting up his character.. and a dad explaining to his son (kid had to have been 8 or younger) the best way to gang bang.
It had it's upside when Jen and I were owning this chick doing a mission and everytime we killed her she would swear and wonder how the fuck we killed her
Again it's neat, but I dont think it helps immersion at all it's just.. odd.
And back on the Galaxy discussion - that would be interesting if the Galaxy doubled as a Lodestar this time around.