There was some seriously weird stuff around prices in Oblivion too. It was as though they had super extreme inflation. Before/without electronic money no one wants to carry round tens of thousands of gold pieces to buy a house. Gems such as diamonds and rubies were vastly underpriced as well. Gold needs to have a weight, encumbrance needs to make things sink in water.
Fatigue is in itself a contradiction in TES. When you have full fatigue you should be lying on the ground exhausted as you would be "fully tired". It should be energy.
love your ideas.
this may be a bit overdone but, no blade or blunt skills.
there would be a dagger skill, a short/broadsword skill, a longsword skill (every longsword was able to be used both with one hand and two hands), a 2 handed longsword skill (longswords that are too heavy to be used one handed such as claymores, zweih?nders, etc, and normal longswords that are being used 2 handed style) , a mace/club skill, a warhammer skill, an axe skill, and a battle axe skill. every weapon is used differently with differing styles. just because you only used longswords to get your blade up to a hundred doesnt mean you can use a dagger masterfully as well, etc.
also, more realistic diseases, and water as an alternative to beer/ale/wine
edit: links
http://en.wikipedia.org/wiki/Longsword
http://en.wikipedia.org/wiki/Two-handed_sword