Hey guys, I've just managed to finish the game. I used to play it many many years ago but finally learned how to do it right just now.
This game had been exciting me for a long time but without any documentation or guides I didn't see how to finish or even play it. Now I came up with walkthrough so if you still want to play it - just let me know and I'll answer your questions and provide the guide.
Some quick hints - the goal of the game as said in intro - is to re-unite Kendar and defeat Scavengers. To do that you need to complete quests for reach race. The Scavengers do have their "homeworld" - it is Yned (1.9,127.1,88.1). This is your final destination after re-uniting Kendar but do not try to go there before that - you'll be overwhelmed by endless wings of Scav's battleships.
List of Kendar races is - Icon (who start it), Ermigen, Quai Pa'loi, Sengzhac, Titarian, The Guild, D'pahk (or D'phak?) and Aard. The others like Phaedor Moch and Void Dwellers are useless for Kendar but play important role in the quests. Ermigen will be destroyed in the process but fear not - victory scenario does not require them to finish the game.
There are several important locations that must be visited during the game:
Sigonib (location may be random)
Igua (108.5,110.1,245.6)
Oetus (238.9,169.5,131.4)
Papesia (107.3,117.8,194.3)
Tyr (247.4,123.3,163.5)
Dubofang (4.3,227.8,240.6)
Suenyo (134.6,122.2,131.2)
You will find there either important information (right upon arrival) or items (may require full scan of planets) that will be needed to complete quests.
Communication - it is not important what you say to an alien race - it will not change anything so it seems that the dialogs exist just for better understanding the game/races/history/etc. The quests are either taken or completed by contacting an alien - you'll see it in the first statement of communication sequence. All the rest does not change gameplay except two cases when you can help to repair alien ship - you'll receive a gift for that but it still is not required to win.
the combat - I advise to install a mix of psion and energy guns that are most power-effective, like gyroid cannons and kyn-pox ichors. Ichors are particularly effective against scav's battleships an gyroids against for smaller ships. They are very long range weapons and can take down armadas without taking a single hit. Sometimes it is more effective against smaller ships to use heavy weapons like Wrath of Shiva or Shadow Kiss but you'll need to come closer to open fire. The most of available weapons is useless - too short-ranged, you'll be dead long before making your first shot.
the crew - I suggest to choose encodes with most wide biorhythms or with 'unknown background' - they are most stress-proof ones and will not go mad. Keep them researching all the time and let them rest from time to time and you'll be OK. You can increase their skills/performance by using mind enhancers. They do not do research during traveling between stars or planets so you'll need to hit time bursts many, many, maaaaany times to reach 20 lvl for all of them.
Upgrades - you will be able to increase ship's hitpoints, fuel/cargo capacity, speed and gun nodes during the game so it is not so important what ship you chose at beginning. Believe me, when you'll be about traveling to Yned to fight Scavengers armada, your ship will be just a mass destruction weapon no other ship can match.
The final scene is impressive - really worth to play the whole game although there won't be much action. Say hello to Monks