I suspect this idea would hurt the AI, it could be rejected on this alone and I'd understand.
One thing I didn't like about GalCiv II (and this applies to SD games in general) is the sheer amount of crappy units the AI tends to generate, which serve as nothing more then speedbumps.
Would giving planets auto-garrison ships and making hyperdrive-capable ships really expensive to maintain cut down on this- also maybe have logistics determine how many ships you can have not in friendly/neutral space?
I haven't thought this idea out much- but curious to see what people thought about it- or I could just be high on bathroom cleaning fumes