From personal experience I can say that having worked for a FX fund manager, cetain black- box systems are "tweaked" to allow for fundamental events to be taken into account.
I know nowdays that many of the big hedges will have a neutral/square possy ahead of leading data, ie NFP or interest rate announcements.
I also believe this is the best way as the hard part is not trying to guess what economical numbers will be, it's the market reaction to that data
Good luck
Marty
