Dwemer dungeons? They should be in Hammerfell, but they are not enough.
More realistic sets of monsters for dungeons (no bears in big crypts, humans for big dead ancient structures)
Towns of orcs who are not allies Orsinium?
The physics of water, not just the texture?
Better and unique capital cities, better base buildings and interiors?
Banners for all kingdoms/duches and biografy and names for all counts?
Unicle questlines for orders of knights and maybe quests of conts?
Herbalism.
More different NPCs sprites, sprites of statues, monsters
More different armor and weapons, replace old armor and weapons to better
Unicle firs persion weapon sprites
Biggest tasks:
The physics of water, not just the texture?
More advanced terrain generator who do more real terrian and recreating of all dagerfall map
Do not take seriously, it's just my dream of ideal game. First steps to it, baisicly