@noal: Whole code of the editor was done by me, other bits are from the game itself, thank Rovio for awesome game that pushed me to do editor for it.

About separation: That's more question to Rovio, you can only bombard them to open new "user" pack.
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On other topic(compatibility of AB levels)
The good thing is, that Android and Palm do have same lua level format, the iPhone ones are different(encrypted). I guess that's because of former App Store policy of not using other languages than ObjC for app development. That means levels are compatible with android/maemo/palm, but not compatible with Apple devices - that's bit sad.