docopoper
http://www.supermariobrosx.org/forums/viewtopic.php?p=22893#p22893
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I have created a tool for making large scale edits to levels, allowing you to do things like:

Move large areas of the level.
Duplicate large areas of the level.
Delete large areas of the level.
Select all objects with a given id / on a given layer.
Quickly find the id of whatever is under your selection.
Resize the window to view larger areas of the level.

Hopefully this should make editing levels much much easier.