You would just put it on prerelease 9 from the list
Triggers like Xtra
Mission Briefs like Xtra
More Player Colors Addable. (Cyan don't even work)
Once preplaced building is hurt on editor, it's on fire or bleeding.
Color Tags for easier use of it instead of Á and those stuff.
Sprites can switch sides (Since it doesnt)
Some other things, that you can't do or might crash:
Two or more terrains at once
Allow some buildings in the Beta Starcraft. A building repairs ground viehicles, a zerg tunnel building. (It's those scout buildings, the scouts that can't move)
Unit Drawer.
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the multiple tilesets isn't possible (at least not unless blizzard adds it in a patch)
the beta starcraft buildings where removed from starcraft and "could" crash the game