I'm honestly kinda shocked there hasn't been one of these already. The only proximity chat there is that I've found is apparently bugged, and only works for text. It's a shame I haven't found one, it feels like it'd be a cool addition. I'm not a programmer, but I've heard from a video by Scruffy on proximity voice chat that it's not _that_ hard to implement- just setting your mic as an input, and making the output a sound effect for all other players. Again, I'm not a programmer, and I could be horrendously wrong, but I think it'd be really neat.