You might want to mention that this is for when making custom civilizations. It doesn't make sense for normal gameplay.
Yes. Some options and combination of traits can make powerful civs. I like mixing the Mimot proliferation ability with the Onyx's promethean ability. The proliferation ability gives you 2 ships every time you build 1 ship at the shipyard but at the expense to the ship's hit points, but the promethean ability doubles hit points which more than makes up for the hit point loss.