The default hotkey is "C" on your keyboard. It cannot be customized atm, but the team is aware that it isn't an ideal sollution and creating a better in-game chat is on the to do list.
Ahh, sorry, didn't get that. Those don't work at the moment either. Fingers crossed they will soon, when there's a proper in-game chat.
Gotta say stuff like this, low hanging fruit, functional, useful, features, would be nice to start seeing in the monthly updates. This sim is spinning its wheels right now, hopefully the push out of the mud is coming, but im starting to lose faith. Always been a big fan, but thats just where im at with R3E at the moment. Chat post race, and simple hot keys, would be good to see.
voice? most of us has a mic, it'll be mainly expletive led I know but isn't it always better when they can hear you calling them a w^*ker and vise versa of course ......at the moment screaming "get out of the way stupid" to some noob your lapping... again, doesn't work ;-)