Yes, my favorite is "how do i turn on engnine." Even an idiot is fully capable of hitting escape, clicking options, and clicking controls. Nearly every game has that. If he can figure out how to install the game, run it, join a server, and chat, then he surely can go look up the basic controls.
Of course, non-intuitive questions such as, "How do I talk to my team only?" I have no problem answering. It's not in the manual, it's not obvious to someone who is unaccustomed to using radios, and it's not a stupid question. I couldn't figure out the chat system myself; I've been playing games and simulators for a very long time, but I've never seen a chat system that worked remotely like this.