NigelC
Chieftain
One thing that bugs me in Civ5 is that it takes just as long for workers to improve tiles later in the game as it does early on. I know that the game is not meant to reflect reality too closely, but I find it hard to suspend my disbelief on this. 
While there are already policies and wonders that reduce the time for tile improvements, I have a couple of suggestions I'd like to throw out there for comment:
1. Researching Engineering speeds up all tile improvements by 25-50%
2. Researching Dynamite allows the building of a new unit to replace the worker (a constructor, perhaps?) which movers and builds improvements twice as fast. If possible, it would also be good if this unit could build roads and railroads on mountain tiles, thus making those tiles passable for other units.
These changes would make setting up a new city later in the game much quicker.
What do you all think?

While there are already policies and wonders that reduce the time for tile improvements, I have a couple of suggestions I'd like to throw out there for comment:
1. Researching Engineering speeds up all tile improvements by 25-50%
2. Researching Dynamite allows the building of a new unit to replace the worker (a constructor, perhaps?) which movers and builds improvements twice as fast. If possible, it would also be good if this unit could build roads and railroads on mountain tiles, thus making those tiles passable for other units.
These changes would make setting up a new city later in the game much quicker.
What do you all think?