I'm planning to make a small game balanicng mod for all of those who modded their game speed to run at 1 year per turn. Namely, in this case the number of turns is doubled so it would be sensible that structures building times would be increased too (preferably doubled). The way things are done now, you can field an army of late medieval units (without gunpowders) in 1200 or even sooner, while "older" units (like Feudal knights) become obsolete very quickly (to be more precise, they are used for only a fraction of actual game playing time). And that's certainly not realistic. Since building times would be increased, income should be slightly lowered (as you couldn't (and wouldn't need to) build structures as often as it is possible now).

Anyone interested?