That isn't a SF problem. The problem here is that ranged SF seem to use Mixed Infantry AI
This is correct. All unit types with ranged attacks that are not archers use the same AI.
And it needs work
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Timothy Collett
"The only thing you can't trade for your heart's desire...is your heart." "You are what you do. Choose again, and change." "One of these days, someone's gonna plug you, and you're going to die saying, 'What did I say? What did I say?'" ~ Miles Naismith Vorkosigan