What I meant by the Imperium Galactica comment was - for anyone who played it - A miniature Starbase IN orbit of the planet (would act as part of the defence fleet via the build ship command and would have to show in the area where the ships are held, and so this would mean that you would have to have a couple of extra spaces. e.g. 1 orbital starbase = 2 slots)
And all I meant by the original post was that if an enemy ship enters the radius of effect of a militarised starbase (anystarbase which can attack, in this case) would be able to make 1 attack per turn.
There could be a mathematical equasion for it - e.g. every square away from the starbase that the enemy is, then the strength of the weapon loses .1 of its strength, down to a maximum of 1 - So, if your starbase has a mass driver strength of 10, and the enemy is on the furthest square covered by the starbase, then it will be able to attack at minimum strength.
The 'assist' modules would have to be programed to disable themselves if the starbase itself attacks, but would also need to be programed for either on or off if there is a second starbase covering the area the enemy is in.
I.E. If you have three starbases (say 2 eco's + 1 Mil) and they all have 4 - 5 squares of the same space in their effective area, and an enemy comes into it, then the military base will be able to attack (because that is what it is designed for) and the eco ones may or may not be able to help. Basically, this idea allows the player to sort of use the starbases like a stationary fleet, spread out with large distances between them.
It's only an idea after all, so whatever you guys diside on, it won't make a difference to the game, unless a Gal Civ III comes out.