User blog comment:Extrasurf/Dynamic Weather Events & Trains/@comment-3455248-20110228235247

I agree on the train if it could be done without introducing lag. At the very least, having a train be a factor in a co-op mission would be great. Your weather ideas would be fun, but so much trickier to implement - rain is one thing since it can be the same everywhere, but the localized events you mentioned would be a lot more difficult to do.