These are ideas for a "conducts" system in Angband, which tracks what actions you perform as interesting statistics in your character dump. These are useful for challenge games.

Track whether the player has:

• used up stairs
• bought or sold to stores
• used any artifacts
• killed any townspeople
• used WoR to return to the town
• cast any spells, by spellbook and spell

Also list:

• total kills
• depth of first kill
• number of uniques killed
• number of visits to town
• number of dungeon levels generated
• turn / depth / xp of first time casting each spell
• number of IDs used

Feel free to add suggestions!