About the E-temenanki "yields on investment" proc. The issue is that the proc can be maximized by relocating citizens (notably specialists) and tiles shared with satellite cities just before investing to maximize how much food and science you get from the proc, then relocate all those citizens and tiles back to what they were, before you end the turn. Which is a chore to do, relocating dozens of specialists and tiles every time you want to invest anywhere in the empire. It is also something that the AI probably doesn't know how to do, making it an abusable feature for a human player.
I'd like the proc to rely on something else than the Capital's yields per turn, so that you don't have to do this citizen shuffling all the time for optimal use of the UB. For instance:
"Whenever you invest in a building on empire, gain 6
![Science :c5science: :c5science:](/images/smilies/civ5/science.png)
Science and
![Food :c5food: :c5food:](/images/smilies/civ5/food.png)
Food in the
![Capital :c5capital: :c5capital:](/images/smilies/civ5/capital.png)
Capital for every Great Scientist born/expended in the empire."