Well, I said I was going to have to learn Lua anyway, for Yuuka.
Though I was thinking for her, her whole "cultivating a garden" deal, and her isolationist tendencies... what if Yuuka got a bonus to internal trade routes? They are more effective, maybe Land ones are as effective as Sea ones too, and either that is just more food/hammers transferred or maybe it generates money as well? I don't know, it's kind of a nebulous idea at this point. (Also, any objections to making her UU the Flower Tank from Story of Eastern Wonderland? Yes, yes, it wasn't her thing, it was Rika's. But come on, it's a flower tank!)
So, Eientei has the best medicine ever and people from around the world come to get it. I had their Apothecary UB be a replacement Colosseum that had two Scientist slots; what if instead it had a Great Work slot, with some kind of deal like the Parthenon where it comes pre-loaded with its own "great work", which are the medicines everyone's coming to partake of? Ooh, and if it replaced the Caravanssary or Market instead of the Colosseum, we could give it foreign trade route bonuses -- like, say, foreign trade routes connecting to this city get bonus FOOD, and give the city's owner something else awesome, a science bonus or an even bigger gold bonus or what have you. Then the UA can be just something focusing on science. +1 Science from Specialists? That encourages specialists, and encouraging specialists fits the "immortality gives you centuries to perfect your craft" theme, but dunno if it actually makes sense with that theme. +1 bonus to all specialist yields? +1 food from specialists, since they are immortal you don't gotta worry about keeping them alive? I dunno how powerful these would really be.