A narrower range of possibilities would help reduce the desire to reload, at least for chests and equipment (if you need potions or traps, etc, from a merchant who doesn't consistently carry them, you would still want the option to reload). The dragon armour quality can range from really crappy (though that is rare) to pretty much best in the game, so you almost need to reload at least a few times to make sure you get something decent. On the other hand, you don't want to limit the range too much, or you might as well not bother at all.
Spellbooks shouldn't be plentiful, so they would either have to remain a fairly low random chance, or be restricted to only certain bookcases.
I found a Burning Wall spellbook in Mardaneus' house when looting, which I used to take out the spider at the bottom of the catacombs (it could kill me in 1 or 2 hits, while I could barely do any damage with my sword).
The only time I recall identified items not having their stats fixed is when they are given to you by an NPC (so they get put directly in your inventory); moving them will fix the stats.
