Add parent-child relationship for voice channels to allow micro/macro communcations

It would be great if a parent-child relationship was added for voice channels, where you could create a parent voice channel and then create a child voice channel, this way people in the parent channel can communicate with the child channel, but not the other way around. It's the same as nesting one channel in another.

This type of voice channel structure would help in MMOs where players need to work in small groups and still hear communications from those in the parent channel in order to work effectively.

One example of this is large scale pvp combat in games, you have smaller (child) groups using voice comms together and focusing targets. But, they also need to be able to hear the comms of those leading (parent) group in order to effectively work in concert with each other.