I took a look into Assets0/1.pk3 files and there were like 5-6 different taunts for the Reborn, taken out from the Single player.
The one used in Multiplayer is the evil laugh, but I'd rather want the "Do you fear me?" taunt or any of the other Reborn taunts that are in the same dir as the "taunt.wav" file.
Can I bind somehow, to taunt the other taunts? And make other people hear it?