[Andrés]

I don't think you'd want to build colony ships only for ramming. But it's a good idea to ram an enemy ship if your colony ship is under attack. You may be able to destroy a small enemy ship with relatively low damage, and even sacrificing it is better than having it destroyed anyway.

Check the facilities in your homeworld, you'll see that you have many research centers and other facilities.

I rarely use non-agression pacts, I start offering a trade alliances (to AI) and trade and research (to humans).

Wish... Considering hostile any ship from an empire you have no treaty with should be fine for agressive races, more peaceful races should consider them peaceful uless they attack first.