A dead Keystone Kop should be referred to by the game as “Keystone Kop korpse” rather than “corpse”.

A small fraction of Kops should generate with bananas, for slipping on.

Copper weapons get a bonus versus Kops.

Cut down on the list of inediate monsters by defining some of them to be either herbivorous or carnivorous (note that the game uses carnivorous to mean “can eat meat” rather than “only eats meat”).

Herbivores:

• Killer bee and queen bee
• All types of nymph

Carnivores:

• Salamanders
• Kops
• Imps, homunculi, tengu, and leprechaun

When you trigger the Kops, it doesn’t immediately summon massive swarms of them all at once. Instead, it triggers an effect that lasts 50+d50 turns, which causes one Kop to spawn on the upstairs and downstairs each turn, and occasionally on random spaces. Reconciling with the angry shopkeeper cancels the remaining duration of the effect and vanishes any existing Kops on the level.

This might have odd interactions if you leave the level while Kops are still spawning. Perhaps it should internally be tied to the level structure, not the player or a global variable; the effect would be suspended while off the level and resume once you reentered it.