From a programming point of view, I would hazard a guess that changing the "shore battery" item to have a 360 degree view might be easier than adding a bunch of the existing shore batteries - in the right places and with the right facing - to all of our maps. But then, perhaps The Programmer might weigh in on this...? 
Depends on how it's programmed, in some cases it'd be easier to make it 360 (although then this would allow you to shell the base as well which can add some negative effects, especially to GVing), but other ways would make it easier to add some in (copy & paste with changing only a few variables) could be easier.
But back to the OP, I say add more SBs that give overlapping FoF rather than just making it a fancy circle turret...