Wait.
Didn't our Civ Ind V trait already put us above average Garden World levels?
Whoops! Meant Pleasure World!
If/when we hit All-10, will there be another upgrade slow down requiring 3 actions per point to grow upwards?
Yes. And before you try to game the system, the cost will increase if you hit more than 30 Dev in any 2 Dev Categories combined.
What i'm most curious is how the Yeeni see themselfs in the Federation, as it's been some time from when we discovered them and well how that changed their culture, and if it was possible that we would never discover them in the first place, them what would happen to their species, because if i remeber they were the nuts that was using the warp without any protections.
They see themselves as kind of the "Younger Sibling" of the Federation, without any ill-will or negative feelings for that.
The most prominent part that changed in their cultures is that, due to the increases in technology, they have become something of DIY Space-Racers with a side of Asteroid Homesteading mixed in. Most other parts evolved from a Siege Mindset (Either for or against me, no in-between) to a Prepper Mindset (Be prepared for all things).
The scenario of "If we had never found them" is only possible if you didn't exist. In that case, the Yeeni would have figured out that you need something to protect yourself from the Warp during Warp Travel and would have desgined a Primitive Gellar Field...which would have brought them to the attention of the Small Ork Waagh you fought at the beginning of the quest. They would become extinct within forty years, the Green Tide burying them and any trace of their existence.
Did the Emperor try to game the action economy when making the imperium? As in, he saw the Slumbering Titan trait and just ignored medicine(or civilian) development and tried to get everything else to X or even XV first, but Horus did the funny, and everything went in the negatives?
Nope, he was a 4/5 Dogmatic, so he told every planet to deal with that shit on their own, he wants tribute now. He planned to "Get Back To That," but...well. Horus did The Funni.
Does A Hand to Hold the Candle, A Hand to Guide the Sword... affect things other than just Chaotic Corruption immunity? I assume it's kind of the average level of fanaticism of our people, and upgrading it means our people are more hardcore believers?
That is basically a Temporal Soul Link for every Star Child worshipper, allowing them to reap the benefits of praying to an entity that technically doesn't exist yet.
And it applies to all Hostile Warp Influences. No, it doesn't mean you get immunity to Psyker Power, those still work.
What's your opinion on our use of the Songs and Melodies? Are we shooting ourselves in the foot by not abusing it for all it's worth?
Are we theoretically capable of becoming as technologically advanced as or close to the old Federation in this quest? Or just more advanced than the Imperium?
Not asking if we will or have any realistic chance of doing so, just if it's possible within the confines of the quest.
Absolutely, 100%. And for what? A stable society, functioning military, and non-self-destroying faith? Disgusting.
Even if I allowed it within this Quest, at the pace you are researching? Nope.
Now, question: What will it take for the Federation to accept the Yeeni as Kin?
Fuck if
I know. You made the qualifications, you decide.
Oh, and don't worry, the Not!False Hydras were the last pre-planned disaster/war in my chamber (besides the Necrons), so rejoice in the knowledge that everything after today is fully your fault! Hurray! 
