i am only talking about space fighting.
i think it would be a missed opportunity to not allow ramming damage and building your own missiles. the effect of these would just be that the people would need to build very versatile fleets and would have to adjust them to the specific era and enemy. let's take a look at space engineers, which doesn't have these limitations. people built incredible machines and weapons, though with differencating usefulness, it still is amazing what things players invented. here some examples:
now, i can understand why you chose to not give players the opportunity to build weapons by themselves, there is the chance that players will invent a weapon of mass destruction, and as you noted before, you don't want a planet killer because it just would be unfair living independently on that planet and just getting nuked. Even though you maybe could invent something like an atom bomb, i don't think it will get used, because a, the mere cost of such a weapon, and b, it wouldn't be worth it bombing away so much just to destroy one single enemy faction. it would be a move just to show power, something a warmongering faction would do, and till now, to my knowledge there aren't any communities that aren't rather civilized.
Now i come to my second point, turrets.
in the past you said you would let bots control the turrets and let them shoot. again, i can see your point, with the small ships simply being to fast. my idea is that there are different types of motors/thrusters. there are the normal ones, which are more sensitive and explode easier, but are faster, and the war motors, which are slower and more expensive, but can take more pressure.
if that isn't enough, my additional idea would be that warships radiate a special energy field that makes ships with normal motors slow way down (except allied ones who've been given the allowance to fly with regular speed). the ability to place a lot of war motors on one small ship could be limited by them getting really hot so placing them next to each other would also make them overheat and explode.
I apologize if i said anything stupid, after all, i am not able to play the alpha right now,
and i apologize for my weird writing style, English is not my native language.