I just saw that a few seconds ago Chaosy xD I'm testing with blizzard.j instead of Blizzard.j
EDIT: Yet, doesn't work. I'm testing by setting bj_PI = 10 and displaying bj_PI after 1 second of gametime.
EDIT: Managed to create a new Custom Script function with valid default text, but it's unilinear; i can't write several lines of code (unless there's a way to indicate a line jump with characters in the TXT editor). I would have to create hundreds of Custom Functions, each one corresponding to a line of the code, and add them all to default trigger that are created whenever a new map is created with the World Editor. Of course, I wont. Manipulating the Blizzard.j file adding "valid" text is ok, JASSHelper reads it, and knows there are no mistakes, but the custom functions declared there can't be used in the map; it makes the map crash a if it were any other wrong script.