Not sure if this will still be worked on, but I have a few ideas of my own. I think there should be 2 new modes, Creative and Free Play.
Creative would be creating your own stars, planets, nations, and would be used in a mission you can create. You would be able to get a code or something from the finished project and would be able to show it to friends. They can then play it.
Now this is what I really think should be added to LOA, the Free Play mode. You would be able to select the year to start on, ( 2130(start of Rise of the UEO) - 2500(end of Ascension) ) and the nation. (certain nations would be available based on year, and can change to other nations, based on what nations you choose.(colonial nation would be split in 2 separate nations that can turn into altairians or seekers) ) Planets/stars owned would be affected by the year and nation. Plus, you would be able to colonize other stars that are not really used in missions. When in range, you would have access to the star. If the star has no real name, the name would be chosen randomly from a huge list of names. The same would go for the planets, if the star's planets have no real name. If the star does not even have planets, some will randomly generate. Habitable atmospheres would be very rare, and any atmosphere would be somewhat hard to find. The larger the planet, the rarer it would be to find, but gas giants would be more common. A few new nations would generate too. Very rare to find, but can occur. These could even include Americans, Europeans, and Asian, but many (random) names/colors could be found. Also, there would be some kind of meter that could show your relations with nations. Oh, and if there are no more stars on the map to colonize, it would randomly generate more stars when closer. All this may require the ability to zoom out more in star view.