Multiplayer should allow more players because when the game came out high-speed internet was still rare, so 8 was the slow limit.
Unless there is a correction in the game speed (turn years) railroads should have infinite movement, because things can go almost anywhere in the shortest time possible (2 years). I for one want this problem to be fixed, and RRs to only give a certain MP bonus.
How often do you reach the city limit?
More Civs, yes.
Yeah, 512 x 512 maps would rule! Or why not 4096 x 4096!?!?!?!?
Multi-terrain units would be cool.
What is the science age bug?