Game time has been discussed in many topics. Even I suggested it in Feature Voting. The thing that is worrying me is that after every new feature, it will be harder and harder to change in game time speed because many new things will be related with in game time.
About the scale, when modding becomes a “real” thing and people mod vehicles, airplanes, objects and so on; I am quite sure someone will mod things according to scale. Look at big simulation or city building games like Cities Skyline or OpenTTD, there is always a huge modding communities that change everything in the game.