I'm in the middle of my first game using realistic corporation spreading. And I have to say I like the idea, but they seem to be a little over-active. I'm only playing a standard-sized map and have 19 cities, but as soon as I hit free-market all hell broke loose. I spend my entire turn listening to the jangle of coins as I get message after message about guilds switching cities - getting about ~10 or so flops per turn = 20 jangles. I don't mind all the switching itself (although as I mentioned, the amount of switching may be a bit extreme), but if there were some way I could disable the alert it would do wonders for my sanity. (Hearing those coins jingle in my head as I type this)