Ment
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Unfortunately, it's impossible to work in it.
I used to do it like this: I would open the script editor, quickly type one character, and close everything as fast as possible before it crashed, including the map editor. This is how I created the script file itself, a quick method. Then, I could edit it (the .lua file) using Notepad directly within the map archive.
There's also a fan-made script editor; you can search for it online.