I think the "Better breaking" option in "Medal upgrades" should be tweaked. It's the only one I haven't completed yet, I'm still at 12/40 because from 12 to 13 it takes 4.19e12 medals. Compared to other upgrades and the medal earning rate, that seems way too high. Especially since I need to do that 28 more times with increasing medal rates.
*) Make ship boosters recycable, when I discard an item I can't tag it on one of my other ships. Very annoying if you found the sail V3 recipe, tag it on your sailboat and not being able to transfer it to your galley once you obtained that
*) Create more direct trade routes connecting cities, possibly with more food costs. It's a pain to see a big ship not being able to move to the other side of the map without having to go through at least three other cities
*) Warehouse expansions. 200 cargo spaces is not enough if you reach higher levels, and let's face it: at this point, only the Picaroon market place is worth something
*) Add an endgame thingy, like a palace or something that you need to put resources and gold in in order to obtain it
*) Loading data is messed up, I get numerous items each time I log in that I normally don't produce
*) Market data is messed up, when I log in I see that all my items are being sold under someone else's name
*) Get rid of the lumber mills or the bot lumber seller on Picaroon, it's insulting to give away free wood AND have factories for it
*) Create bot buyers that will buy goods from the market every now and again (lowest prices first)
*) Create some way to buy additional workers. Within the twelve cities there are 29 goods producing buildings to buy. Each building can host 3 workers, so that means you need to be level 88 before you reach endgame for producing goods
*) Create tags on the recipes so that you can see what the effect will be beforehand
 "Block Fuser"){kind=icon}
 "Free Traders"){kind=icon}