Dark Prince:
I think the part about multiple draw offers isn't appropriate. Yes it is annoying and yes it is bad manners but this can happen in any game on Brainking and I see no reason why Espionage should be treated differently. BK is no different to playing over the board, you politely decline the first time, do it more firmly the second time and then ignore them. They get the message. If it reaches a point where it is harrassment you can appeal to the arbitor (Fencer here).