A guide for each faction? We were doing just that before i "retired" from modding. The forum is not big enough to post all of the info, and i know its a pain to sift back through pages. Plus i hate repeating myself over and over again. However this is really the only medium we got at the moment. The only true way to learn is to play each faction, and check everything out. Well see what we can whip up if we got time.
Yes the Borg are intended to be an AI faction. At first the Borg were the Pirate faction. However the Borg were just pure steamroll as pirates. Every 30 minutes one of the other AI factions would die! Plus there were problems with game crashes with the Borg as pirates. Something about pirate raid weights we didnt understand at the time. We wanted to make it to where you couldnt select the Borg at all, but that would have caused more problems than it solved. So we live with them being selectable. Which is not a bad thing. Players can check them out and see what they can do. Just know if you play as the Borg the game is a cakewalk.
With Rebellion it will be interesting to see a Borg "rebel" faction.. A splinter in the collective like Hue. Yikes that will mean 10 different factions in SoA 2 for rebellion
No worrys we are still gonna focus on Diplomacy until we get the new update out.. Dont ask when it will be out. We still have a LOT of things to fix, and to do to it.
Vulcans as a faction are out of the question in a TNG+ mod. Wouldnt make any sense for Vulcans to fight the Federation. No we are NOT doing other era's... least not yet. Besides there is NOT going to be another "official" update for Entrenchment. However once we get the new Diplomacy update out, we will look at "downgrading" it for Entrenchment. IF we have the free time. As far as Original Sins goes. I can safely say we are done with that. No point in making another version for OS.