Just some things I'd like to see in DA that I think are missing from GalCiv2.
1) Defensive bonuses for smaller hulls, penalty for large.
Reason: A fighter (tiny) should be harder to hit than a capital ship (huge). This is sort of a Space Empires thing, but I think it would add a bit more to the game especially if you take my second idea into account.
2) More Weapons, especially weapon types.
Example: Researching Beam weapons would give you a variety of weapons not just "better" ones, such as autofire lasers (small damage but very accurate), spinal mounted lasers (difficulty hitting small ships but hits large ships hard), just more variety of weapons. Right now the weapons simply scale up, there's no real variety in the tech tree at all, you simply research for the smaller sized harder hitting weapons as you go along.
The Nano-Ripper is the only weapon I can think of that stands out. The game could use more weapons like this, and more weapons in general.
Some weapons would be best fit on small hulls like autocannons (but still be advanced weapons) and some would fit best on massive hulls (better at taking down other massive ships, ect). I think it's kinda boring right now fitting a doom ray on a small hull or a massive hull with no real difference, cept for some reason it takes up more small on a massive hull and does the same damage?
3) More Espionage!!!!!!!!!!
Example: Well just more espionage.. terrorism, inciting revolts, stuff like that, I think that this kind of stuff is going in though... a suppose a penalty for doing "evil" things such as terrorism though.. perhaps more of a downside to being evil in general, being "evil" seems to outweigh any negatives.
4) More Race Specific Technology
Example: Just more stuff to make the races different, maybe Thalans can get some organic armor or weapon tree (if that suits them I think it would), stuff like that. Just more flavor, maybe race unique buildings too? Like a slave labor factory for Drengin or some kind of uber embassy for Terrans, whatever. I know there is already some race "super powers" coming in DA but I think they could expand a LOT on this to be honest.