The VoIP function can be useful even if it’s too often used by really nice people who just flood the canal.
But the feature as working as it is still lack proper device selection and/or testing feature.
I guess that it use the default input device, but if you don’t check it every time you plug your microphone you can’t know if you are talking to your team mates or not.
When the input device selection is not required, a input volume bar would be a great addition to the Voice tab.
Also adding a redundant Push-to-talk binding on the Voice tab would be more ergonomic putting everything about the VoIP on one place.