Give the dwarves a railroad-type improvement that can only be built on mountains!

I remember that in one of the fantasy scenarios that came with Civ 2 Fantastic World the developer decided to make the railroads into invisible tunnels, which worked pretty craply
Anyhew, I've got to playing a bit more now, here's my constructive thoughts (Saying it's brilliant would be extraneous

), although they're all pretty obvious so maybe you're already considering them:
-Plague consistently occurs at the start of my games, and doesn't add anything to the game in its current state. It may occur later in the game, but having plague at the beginning seems pointless. Maybe it's just me though.
-The Elf warriors at the start are just ugly and do not befit this elegant race. I'd change them to anything different to the gollum-esque graphic currently used. Furthermore, these units are mass-produced by the AI, and elves aren't meant to be one of the more populous species in the game.
-I played as the orc race but there was no basic orc warrior unit... the goblins got to use them, and yes we did have black orcs to make up for it, but it seems a bit of a waste.
-Will the Bretonnian units get more colourful?
-Although the farms and roadwork systems are pretty, I don't think having little houses dotting the screen is all that sensible, especially if the land they're in is populated by peoples that live in caves and little huts...