Sometimes you have a nice famed weapon that you want to use on a future brother, so you just keep it in your inventory.
But each time you sell off all you loot, you almost always come close to accidentally selling it, right?
That’s why I wish for a “sell lock”, similar to how you can press “alt & right click” to have items repaired in your inventory, you could have it like “s & right click” to make it unsellable untill you remove the sell lock the same way. Perhaps have a small padlock shown on it, similar to how armor has it when in battle.