Yeah that's the other thing. You can't have too many prospects on the 40 man because you need to fill a 25 man roster. So adding Bergen and Romano, and then having to remove them because you signed a few FA's, or because you had to replace the talent that were taken off to add Bergen/Romano in the first place just creates more problems.
What Shatkins needs to do is more Cashman type of trades. Take some excess fringe 40 man roster types and trade them for something. International space, equally fringey talent who don't need protection, etc. Makes life a bit easier.