Setting aside all that, its a problem in multiplayer. Most of my friends don't do it, or would use it as a joke. But occasionally we get a random who thinks its the most brilliant thing ever that they discovered and nobody else knows about facepalm
I can relate to this ... But playing with random unknow people allways means risking to meet with somoene who have different approach from your own. :-/
I would still say that better solution to this problem would be to allow game master to kick players out of his game ...
The host can kick people in multiplayer, but I have not yet used that option. Most people just agree not to use it when asked. I don't think I would kick them if they went ahead anyway.
