Anti-magic fields end a bunch of temporary magical intrinsics, such as speed or see invisible.

Allow capital letters to be entered at direction prompts.

When you have greasy fingers, you can touch and pick up cockatrice corpses safely.

When a monster wields Vorpal Blade out of your sight, you hear “a distant snicker-snack”.

Non-weapon stethoscope skill, which gives less information than it currently does at Unskilled (perhaps just HP), the same amount of information as currently at Basic, more information like pet tameness and apport at Skilled, and a full probe at Expert. Possibly it also takes a full turn to use until Basic or Skilled.

Gloves that give a boost to multishot somehow: either increase the maximum by 1, or reroll the roll if it happened to be 1, or something. There’s debate on how not to overpower multishot with an item like this.

If you die from overeating and then are lifesaved, you automatically finish eating.

Chicken eggs identify as such when you formally ID them, and all eggs of a known type stay identified for the rest of the game.