I remember folks asking for a turret system like this in the pre 0.09 days and schema responded that it would be too complicated to be worth the effort. However we've come a long way and I'm sure Schema has learned to use the Shrine engine a lot better since then, so creating system like this shouldn't be such a hassle than it would have been back then.
But even if Schema would start working on this right now, it still would easily take over a month to code this thing in.