Yeah, I can see some of the tactics some of my group have used in the past would require Cheap Shot or Called Shot. On the one hand, not having that kind of option as a basic combat maneuver can be somewhat limiting for those that haven't taken said tricks, but it does prevent some of my smarter players from using actual combat tactics while not rolling with combat related skills.
That would mean I would have to save some of these gimmicky ideas for when someone actually does go through the trouble, but i get to highlight their choice of tactics once they do.
An example from a previous campaign in 4e: Shooting at a dragons wings to impair it's flight. In FC that would be a Cheap Shot to flight speed. The player might be able to think of that, but it would be implied that if he hasn't taken Cheap Shot as a trick, his character wouldn't have thought of it. Is that a fair assumption, then?