This feature request is not for chat but radio. Actually, the voice radio is just filtered by channel, without consideration about range, jamming, ground masks... You can't scan, point at direction, reveal radio emitters.
The reason why EH or MEH could enable some scripts when AIs/players use their radio.
Examples:
- if leader player is separate from his group/ other players by a hill, radio can be blocked or dimmed, (except if backpack is a radio but this can be scripted in EH code);
- if an AI/player emits within a short distance from enemy, reveal it to enemy;
- find azimuth of emitting unit;
- script radio volume for what you want...