Rofl nope. Just click to settings and try to figure out which capture device is actually the good one (there are usually two of them). You also need to decide wether you want to put it on push to talk or voice detection
Oh. That's a bit excessive imo. Mortar used in a non ordinary way is pretty awesome. For example I remember a fragmovie in which it was being used on Aldernest to spawnkill the axis team