The locked out parts were locked simply because they were extraneous or useless. You can't use a .unit tag as far as I'm concerned.
The CE editing kit came with the ability to create a completely custom map. You could have easily tossed everything aside (save for the ui folder, widget definitions were locked), and built a whole new concept from the ground up.
The Halo 2 Vista Map Editor only has the ability to create a custom Halo 2 map. No more, and much less.
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