The Iconians start with this, and you can choose it for custom races - it increases your social production and research by a ridiculous 200% while halving your ship production. Except it doesn't halve it - these modifiers are, as far as I can tell, additive, so the more shipbuilding modifiers you have (if creating a custom race, militant+2 alone covers a good share of the -50% you start with), the less pronounced the starting penalty will be. Adding up, the trait effectively gives a net +350% in your production modifiers.
Slow ship production is pretty bad early on when you want to send out as many colony ships as possible, but you are building improvements and researching colony techs so fast that it doesn't actually take long to catch up - thanks to you building farms, cities, terraforming, starports and whatever twice (or more) as fast as anyone else your raw production will be miles ahead of everyone else, not to mention that you can basically build every single galactic wonder you want (I think the only one I missed in my current game was strategic command).
Perhaps it was mostly made with the Iconians in mind whose expansion is probably hamstrung in the AI hands with the penalty to building colony ships, but I paired it with Time Travelers and a militant, productive race and very quickly snowballed out of control in practically every category available. Point being, perhaps it should be toned down a bit... or a lot? Something like decrease the SP and research bonus to 100% or make the bonuses +50% and the shipbuilding malus -33%. Currently it feels really out of proportion.
