I think that the OP had a pretty reasonable request. These forums are here to help others and point people in the right direction by discussing the games and their issues or merits. Posting unhelpful, mocking or VERY opinionated responses is just asinine and pointless - more to the point its basically trolling.
So @ the OP. I havent yet found out how to switch off the god darned propoganda speeches. But i have just dealt with it and embraced it as it might be annoying but it does add to the ambience and atmosphere of the game. Just reiterates the mindless propaganda that the Zones inhabitants are preached to constantly.