Chaotic Knights should still have a set of role penalties, not necessarily the same caitiff ones as lawful Knights, and maybe not as many, but still something that emphasizes that a chaotic knight is still a knight and is expected to have some pragmatic self-discipline.

Add a way to show nearby unseen pets and possibly also peacefuls. Using a warning-like system, they render as green 1-5 (pets) and blue 1-5 (peacefuls) using the same scale as warning does.

Initial idea was to tie this to intrinsic warning or when wearing a blessed ring of warning, but this has flavor problems since warning exists to alert you to threats, which pets and peacefuls aren’t. Plus, a lot of roles get intrinsic warning anyway, and rings don’t generally change behavior based on beatitude. It might be better off coming from some other source.

Peaceful monsters casting spells do not interrupt multi-turn occupations.

Cursed bags of tricks create tame monsters instead of peaceful or hostile. This is a “bad effect” since you cannot use them for sacrificing.

Some mechanism, maybe a new object that you can place on the ground or a spell you can cast, that drives peaceful and tame monsters several spaces away from you.

Unicorns are more likely to generate peaceful if you are celibate and have not yet dallied with a foocubus in your game. (Since coaligned unicorns are peaceful anyway, this would affect cross-aligned ones only.)

Chatting with peacefuls with high Charisma can get them to tell you about what they’re carrying. The stated goal of this is so that the player can learn whether it’d be worth murdering them for their gear.

If you have not killed any gnolls by the time Yeenoghu shows up in the game, there is a slight chance he will be peaceful.

When you anger a peaceful monster capable of speech, it may call for help. Other peaceful monsters of the same monster class within a fairly large radius may wake up and, if awake, will become angered.

If you’re wearing some orcish armor, some orcs may see you as another orc and be peaceful. Possibly the chance of this happening is higher for each piece of orcish armor you are wearing.

Certain monsters will seek out certain types of items and pick them up even when peaceful. For instance, hobbits will find and pick up rings, especially rings of invisibility.

If the player can displace peaceful monsters, hostile monsters should be able to as well.

New exclamations for peaceful monsters getting mad at the player when they attack another peaceful: “Hey!” “Stop that!” “Get [him/her]!” “Oy!” “Jerk!” “Try me instead!” If hallucinating, add “Dude! Not cool!” to this list.

If you can see a monster only with telepathy, you cannot see its peaceful/hostile status, so all monsters appear hostile by default (except tame monsters, which you can still see as tame). Likewise, you can’t see the monster names of non-tame monsters you can see only with telepathy.

You can displace peaceful monsters (but not shopkeepers, priests, or Quest leaders) by either walking into them (as the default choice) or by walking into them preceded by the m key.

Shamans count as clerical spellcasters and follow a god. If they follow your god, they are peaceful. Killing them will anger their god.

Dragons’ alignments are adjusted so that the values actually matter (at the least, yellow should be very lawful, gray should be pure neutral, and black should be very chaotic), and are not specified as M2_HOSTILE anymore so that they can rarely be generated peaceful. Perhaps more interestingly, their difficulties should be varied.

Goldfish, a ; monster that is level 0, always generates peaceful and has no attacks. The purpose of having it is for flavoring special levels, especially quests.

If you attack a peaceful monster, other peaceful monsters that saw the act but grudge the first monster will not be angered.

If you attack a peaceful monster in sight of your quest guardians and leader, they give you a warning rather than instantly becoming angered.

Playing a wooden harp (and possibly a wooden flute) near intelligent peacefuls may cause them to give you some money or items from their inventory, but there’s also a chance that they become hostile (without an alignment penalty though).

The player’s own ghosts generate peaceful (possibly only in bones files).

When a monster decides whether you are peaceful and makes race or alignment checks to do so, they do it based on polyform, current alignment, and when they first spot you as opposed to when they are first created. If the player polymorphs into an orc and some other orcs are hanging out in an unexplored room across the level, they should be peaceful to the character as long as the character is polymorphed into an orc (but will turn hostile when she changes back).