I like this list mostly, though I have a couple of suggestions.
I disagree with Athelas. I'm not sure about 1st and 2nd ages, but by the War of the Ring, pretty much everybody except Aragorn regarded it as useless. I think there was something about only Isildur's heir could use it, too. (What would it do, anyway?)
I also think something like Wargs should be added, otherwise if you have Good mounted units require horses and Evil ones require nothing, it's a substantial imbalance (unless the Evil ones are significantly weaker, and then it's an imbalance favoring any Good player with horses). EDIT: Whoops, only read the first page. If nothing requires anything, it's fine.
Definitely implement the metals system from FFH, and definitely make Mithril rare (like 1 or 2 tiles per map), but have it so that it counts for more than one resource so you can have one source of Mithril but still trade it around.