I personally love voice chat, but in a game like this it's a lot more work than it's worth
Tribes 2, the mother of all Torque games, HAD voice chat.
The Torque engine is not the Tribes 2 engine, but rather a heavily modified version of it.
Also, if you look around the TorquePowered forums, there is talk from people wanting to implement voice chat, meaning it isn't in their already.