While I like this being in SSRP, I really don't think it'd would work well for TTT.
TTT is obviously a team based gamemode where a lot of global communication happens at any given time. Limiting voice chat to the general proximity would make it harder for everyone to communicate, I can foresee people just grouping up together in small spaces just to be able to hear on mic which would make the map (and game) a lot more claustrophobic than it already is.

Uzi this isnt like ssrp that ppl cant hear you over distances im suggesting that ppl cant hear someone in nether while they are in the overworld . Ppl in overworld for example on top of tower would still be able to hear ppl inside tester. Since the map is so small it just wouldnt work if ppl couldnt hear over shorter distances (it wouldnt make sence).