The Static defense platforms in the game are always wonderful to look at and really have the feel of being proper planetary defenses, but it never seems fun when they are simply passed over. you would think they would be able to reposition. Now i understand in early game this would be a bit much, but i feel they should have the capacity to move and adapt to an attacking force. A late teir ability in the defense tech tree giving the turrets the ability to shift orbit around a planetary body would be a god send. Now when i say "shift orbit", i wasn't thinking that they could reposition themselves anyway they like, rather that they could change the position of their orbit and not the distance from the planet. This would give them an activatible ability to circle the planet or asteroid at the same radius or distance from the centre of the planet. So if you placed your turrets farther out, it would take them longer to move around the planet as compared to a turret placed close to the planet that could move faster around the circumference because it has less distance to travel. The defenses, would still keep a portion of their static position, but not completely useless, to planetary bombardments from the undefended side of the planet. This may also make people construct the turrets closer to their planets. The speed would be very slow of course, and this movement may or may not temperarily disable its weapon systems until it stops. Also what would have to be worked out is that it doesn't stop right when something comes into the edge of range. It would also have to be worked out if it were to be put on auto-cast, that they won't chase after scout frigates or how many would begin to move depending ont he incursion force.
I'm not sure if this point has been raised before, or if it clashes too much with what the developers had in mind or if its too over-powered, but imagine the look on someone's face when they see your easily out-maneuvered plantary defense platforms creeping around both sides of the planet in a pseudo-pincer movement. Hell even the death star could move. I just love the feel and look of the defense platforms and wish they could adapt to the strategies of your enemy and ensure the safety of the populace they are supposed to protect.