I would like to see, probably in the Rarity Provision House, a recipe to produce buffs for speeding up both Geologists and Scouts. They could be quite a "top-end" item made from rarer ingredients, and speed these searches for treasure, mines etc up by a factor of x2, with the possibility to extend this to x4 or however high and fast BB would like to take it. Another speed buff would be appreciated for General's physical movement speeds, if any army "charged" me at the pace these Generals move, I think I would die of laughter before they even laid a sword on me! Unsure exactly how popular these would be, and I totally understand the need for time-sink in the game, but some things are just far too slow to be anywhere near realistic.
Hano