I remember my own unspoiled days.
Quite rarely I found a scroll of greater identify, so I tried to use it on some item hoping to learn something new about the game.

For example:
I was very angry to see this trash.
Indeed this info helps the players to get past ToEF (by the way, I never got past it unspoiled).
I really wanted to know it.

Actually, greater identify shows info that is not useful. DV/PV can be measured by equiping. Damage and toHit is not important except for weapons, in which case you can also learn it by equiping. Weight can be easily measured by dropping it. Autocursing items can be remembered after equiping them as a great threat.
Intrinsics is perhaps the only interesting thing. However, it is not really valuable because:
1. Most items don't grant them.
2. There are potions of insight, so you can deduce intrinsics for common artifacts after playing long enough.
3. You see your instrinsics (and which of them are granted by item) when you die. Dying is actually a thing that an unspoiled player does A LOT.

I propose to write manually a description for each item that would be shown when 'greater identify' is used on them. This description should at least say what are the results of the normal usage of the item. Of course, the nontrivial usages should not be told to the player.
It is necessary to remove the spell "Greater Identify". Only the rare scrolls should be the source of such a valuable information.

Examples:
blessed SI - multiples quickly when carried; selling is the only way to get rid of it
uncursed ring of ice - when worn, it protects your items from fire
blessed ring of ice - when worn, it protects your items from fire very well
blessed potion of gain attributes - when drunk, it grants +1 to all attributes permanently
blessed oil of rust removal - if an item is dipped into it, the rust is removed from it, and it becomes rustproof
cursed potion or water - if an item is dipped into it, it becomes cursed
blessed scroll of vermin control - when read, stops breeding monsters from multiplying at the current level (??temporarily??)
blessed scroll of identify - when read, identifies all items in the inventory and detects their status
cursed scroll of identify - when read, identifies a single chosen item
uncursed hatchet - can be used to cut down a tree
etc.

Obviously, such a change means nothing to spoiled players.
However, it means a lot for unspoiled ones. They can gradually learn what the items are used for (at least normally).
It can clarify how much something helps (in number). Or at least explain that the effect greatly depends on the BUC status.

P.S. To the guys who managed to win ADOM unspoiled: you are like gods for me =)

EDIT: found a related issue
http://www.adom.de/forums/project.php?issueid=782