Some ideas i have in mind is
- change the hideous Fort improvement into the castle graphic, it smaller looks better and it should be able to garrison up to 5 units at a time.
- Citys built along a river should be able to build a harbor and it can be used as a trade route
- Change the time scale so every era it goes up one year at a time until you enter a new era it changes to the appropriate year, example is you are in the Ancient era and the year is 2000BC, it goes up one year at a time until you enter the classical era and the year changes to 300BC, the into the medieval era and it changes to 1099 AD, then 1499, then 1865 then 1969, then 2011. The tech tree would have to change to suit the tech in each year but it would be a good way to experience every era in the appropriate time frame, when you enter the industrial though it should go 12 turns until it enters a new year, to have more time for the late eras.
i doubt these even get read or considered but it thought i might as well give it a shot.