Q: sudden brain burst 

, this fleet.txt idea of yours.  Have you thought of including fleet strategies??? ie, set different styles of fleets with goals in mind (guard wormhole<pick target>, attack target<enemy homeworld>, defend target, colonize target etc), that way there could be a specialized 'attack homeworld fleet' or 'capture planet' fleet that will use the appropriate strategy from the files and upload troops/pop etc to achieve that goal.
Food for thought........
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"The Empress took your name away," said Chance.
Owen smiled coldly.  "It wasn't hers to take.  I'm a Deathstalker until I die.  And we never forget a slight or an enemy."  -Owen Deathstalker.