Let me first say you did it, I have left many comments and you have always listened to your customers.
1) Transports ships are ungaurded, even at godlike difficulty all I need is a couple of ships to prevent invasion because a transport ship is always accompanied by 1 medium vessel, this is the only thing holding back the game from giving you a great challenge. A Battlefleet should accompany transports.
2) One of the game options for technology should be this
Player can only trade techs with civilizations you are allied to
This will make diplomacy so much more important and make so much more sense. Alien civilizations wouldnt trade tech unless they were allied. I think it would be a fun option to have
3) Another option for technology has to be
Player can only acquire trade "techs" through espionage
For a super challenging game that still gives you the thrill of getting techs from opposing player
4) Make precursor worlds a little more prevalent, I love seeing that pinkish purple planet, nothing quite like that.
1 & 2 are the most important for a truly wonderful experience that I will never stop playing until I expire.
This is all that is needed for the greatest strategy game of all time. I have put a 1000 hrs easy in playing the various incarnations of Gal civ III.