Mafia automatically recognizes monster encounters, even if the name isn't in monsters.txt. This means that things like CCS sections and auto olfaction always work if they match the monster name on the fight page.
I guess monsters are added to the data file quicker if:
- they have drops, since that is something we can't deduce from the fight page
- we have some spaded stats from a reliable source
- a dev actually bothers to add them