One very useful feature is the ability to name unidentified item types. Rogue had this, and I'd like to see this in JADE, too.

When you use an unidentified item such as a wand, and the result doesn't reveal what the item was, the game will then ask you to name that item type. For example, if you zap an oak wand at a goblin, and the message displayed is "The goblin seems to blur for a moment", you can call all oak wands something like "blurring monster". When you find another oak wand, it will be displayed as oak wand (called "blurring monster") or similiar.

There is also the ability to name items at any point during the game, by using a special command. In JADE, the key for this command could be same as naming monsters (n), and the game would ask "Name a [m]onster or an [i]tem type?". When one puts on a silver helmet and then suddenly starts teleporting around, he could then name silver helmets something like "teleportation".

This is very useful when trying to deduce what an item is, especially when you know what it is (such as in the previous helmet example) but the game won't add it to the "identified items" list. When one finds another item of the same type later, he will know what it could be and what it is not based on his previous discoveries.