In other news, I've been doing some play testing on the latest available version, and I have a few observations, playing as EA:
I never built a Saggitarius, because the Omega became quickly available.
The Saggitarius is a Missile vessel, it should carry missiles.
The Omega is available before the Hyperion or the Nova (these last are - B5 wise - older that the Omega).
The Oracle (ELINT / explorer) is useless, by the time it became available I already had explored a 3rd of the map with a fighter equiped Omega. The Oracle should be available in the first stages of the game.
The Energy weapons techs, are at the beginning of the tech tree, and railguns are at the middle of the tech tree, I believe that the railgun tech should be one of the very firsts to be researched, after all, an Artemis is a railgun equipped vessel, how comes that you can build Artemises before researching the railguns tech.
Starbases and the early orbital engineering tech should be available early in the game, after all, in RL the International Space Station is already orbiting Earth, and that space station certainly fits into "early orbital engineering".
the fighter craft tech should also be available for research sooner in the tech tree, as a matter of fact in the beginning of the tree, how comes that the Starfury Aries can be built without researching the fighters tech.
It is in IMO that fighters should have a smaller operation radius, this also applies to missiles.
Also IMO, hyperspace should be available sooner, at most, by the end of the early stages of the tech tree. How comes that jump capable ships can be built before having access to hyperspace itself?.
The Streib collector is more powerfull than the Omega.
The Hyperion is more powerfull that the Omega.
Since the Omega is based on the Nova´s hull, both ships should have similar sizes.
The Avenger Carrier is available too late in the game, this is an early vessel contemporary of the Saggitarius.
Those are the points I remember at the time of posting, will let you know if I find something else.