Localized voice completely changes the dynamic of the game mode, and I would argue that it's for the worse.
If you genuinely dislike multiple people trying to talk on the mic at once I would advise that you use microphone timers rather than localized voice.
It encourages people to conserve their "mic time" for when they really need it...like, when they've got a knife heading for their liver. Most TTT servers have it.
If you can figure out a way to make it so people in the VIP group and Admin group have unlimited talk time, or an extended talk time, that would be great too.