Lots of people on the forums probably will not like this suggestion, but if you are using patch 1.21b on your Warcraft, just download Grimoire from this thread:
It removes all the limits on World Editor and has other cool features too. To use it, just fire up we.bat from the newly downloaded grimoire folder. There's documentation too. That is a way you can get the no-limits functionality of WEU without the possible map corruption.
That's what I use to do my map editting. It leaves WE just the way you found it but adds an advanced options menu to the far-right, after help. And I am guessing if you are using WEU instead of Jass NewGen Pack you are more a GUI user, like me; Grimoire does not require JASS knowledge.