Are there more scripts like Blizzard.j to modify?

Many of the scripts in Blizzard.j call other scripts that I can't find. For example, one function calls a script that checks for victory whenever a player's building is destroyed and I want to change it to only check for town halls.

Are there files other than the blizzard.j and common.j with similar scripts to edit?

No, there are not (if you don't count the AI scripts).
The functions in blizzard.j only call functions in blizzard.j or natives declared in common.j (which you can't modify because they are hardcoded)

yeah, it's those natives or whatever that I keep wanting to modify. If anyone figures out how, be sure to post it.