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I'm not aware of a solution for the auto layout or dragging the mapplets around the screen. However when working on mapping with a large number of mapplets like this it can help to use mapplets in mapplets to batch them together.
For example if you had 120 mapplets, 12 mapplets each containing a further 10 sub-mapplets will make the UI less cluttered and easier to navigate.
At run-time all the mapplets will be flattened out so there would be no performance hit.
Thanks Robert! I grouped all my number validations into one mapplet and it did make it easier to deal with.