Suggestion: Drop the current production cap of 3 turns to 1 turn.
There are so many choices to build in each city (including outpost upgrades, etc) now, that i'm finding high production cities (50/turn +) are being unduly penalized by the 3 turn production cap. This cap may have been necessary in some former version of the game, but as it stands now i see no valuable reason why this archaic and seemingly random rule needs to stand. Starting mid-game, game turns can take a long time (due to exploration, tactical battles, etc) and three turns minimum to build anything becomes a chore rather than some engaging, random limit which may have formerly caused the illusion of fun.
I propose dropping the limit to 1 turn.