The Tavern

As far as I can tell, in 0.27, all equipment auto-id's when you walk over it, so the only use of scrolls of identify is for potions and scrolls.

Once the player has identified the last potion/scroll, all scrolls of identify should disappear and no more should generate, as they are both useless and still auto-picked-up by default, thus becoming an active nuisance.

They could just get marked as useless, just like ?enchant scrolls are marked as useless for Felids, and ?summoning gets marked as useless when you sacrifice love.

They're actually useless as soon as you have only one unidentified scroll and one unidentified potion.

Even once all consumables are known, you can still use them as slime food for Jiyva piety.